Are they really my parents?

If both of my parents have O positive blood, is it possible for me to have O negative blood? I have been told that it is not possible, that one parent would have to have the negative factor. I have been researching this question for some time with no good answer. I would really appreciate your help in answering this.
Debbie Howlett – Farmington, New Mexico

Are they really my parents?

Dr. Greene’s Answer:

Genetics can be so confusing! I can easily see how after much research the issue would still appear murky.

The modern science of genetics had its start in 1866 when an Austrian monk named Gregor Mendel provided a simple yet powerful description of how traits are passed on from one generation to another. Mendel’s work was unappreciated until 1900 — more than fifteen years after his death. In his initial formulation, he described how sexual beings get two genes for each trait, one from each parent. The trait expressed, or visible, is a result of the interplay between these two genes. Specifically, he recognized that some genes are dominant and some are recessive. If you have one copy of a dominant gene you will express that trait, regardless of the other gene. In order to express a recessive trait you must have two recessive genes.

Mendel’s first experiments, though simple, were quite profound. He worked with peas, which had easily distinguishable traits, such as green versus yellow seeds. Each pea has two seed-color genes, one from each parent. The peas with two yellow genes were yellow. Those with a yellow and a green gene were also yellow; only those with two green genes turned out to be to green. Thus yellow was dominant over the recessive green gene.

The situation with human blood genetics is far more complex, since at each point there are multiple possible characteristics. Nevertheless, the genetics of human blood is far better understood than that of any other human tissue. While there are rare exceptions, the following information on blood types applies to most people.

First, let’s look at the ABO blood types. Each person receives an A, B, or O gene from each parent. In this system, the A and B genes are co-dominant and the O gene is recessive. Thus, a person whose genetic type is either AA or AO will have blood type A, those with genetic type BB or BO will have blood type B, and only those genetic type OO will have blood type O. This means that a child with type O blood could have parents with type A, type B, or type O blood (but not with type AB). Conversely, if two parents both have type O blood, all their children will have type O blood.

Another medically important blood type is described in the Rh system. These genes were first discovered in the rhesus monkey, hence the designation Rh. The Rh system is actually far more complex than the ABO system in that there are 35 different possibilities that one could inherit from each parent. These, however, are roughly grouped into positive and negative types. In this system the positive are dominant over the negative. If your genetic type is ++ or +-, your blood type will be Rh positive. Only if your genetic type is — will you be Rh negative. This means that if both parents have Rh+ blood with the +- genes, they could have children who are ++, +-, or –. In other words, their children could be either Rh positive or Rh negative. Children who are Rh negative can have parents who are either Rh positive or Rh negative.

Two parents who have O positive blood could easily have a child who is O negative. In fact, most children who are O negative have parents who are positive, since the +- combination is so much more common than the — combination.

As it turns out, there are more than a dozen complete blood group systems other than the ABO system and the Rh system. This makes great precision possible in looking at inheritance and family trees.

There is no reason, based on your blood type, to suspect that your parents might not really be your parents. If questions linger for other reasons, specific tests are available through blood banks and private laboratories that can settle the issue. These tests are commonly known as paternity and maternity DNA testing (for father and mother respectively). Given the billions of unique people on this planet, the power and precision of genetic testing are amazing.

Dr. Alan Greene

Dr. Greene is the founder of DrGreene.com (cited by the AMA as “the pioneer physician Web site”), a practicing pediatrician, father of four, & author of Raising Baby Green & Feeding Baby Green. He appears frequently in the media including such venues as the The New York Times, the TODAY Show, Good Morning America, & the Dr. Oz Show.

  1. Carol

    Can a person have blood group O and neither parent have that blood group?

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  2. I. McNutt

    I was born to a mother with AB- and a father as O+. I was the second child and mom never had any shots after her first birth or when carrying me. Can this cause health issues for the second child? And if so what can the issues be? I have had a lot of health issues my entire life one thing after another could this be why?

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  3. John J

    If both parents are O+ , and they have three kids that are O+. Is it possible for a fourth child to be O-?

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  4. stumped

    I have 2 children with o+ blood type, I am o+ and my husband is o+, he has a daughter from another woman and this daughter has ab- blood type, the daughter says her mothers blood type was also ab-. Is is possible that this is his daughter?

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  5. payal

    My brother blood group is “O”positive and my sister in law blood group is “AB” negative but my nephew blood group is “B” positive it is possible or not?? Plz help us..

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    • It’s not the most common blood type from this mother and father, but this is possible.

      Each person receives an A, B, or O gene from each parent. In this system, the A and B genes are co-dominant and the O gene is recessive. In other words, both parents must have type O blood for their children to have type O blood.

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  6. Rose

    My parents were blood o group but my brother is a resus negative mine is a possitive can this be ??

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    • From the information you’ve given, it’s impossible to know for sure. If both your parents were O- all their children would be negative, but if either of them were O+, this is a possible combination.

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  7. christy

    Yes my blood type is ab+ and one of my daughters just found out her blood type is b- Her father is adopted and he doesn’t know his blood type. There is a chance he could not be the real father, so what would his blood type have to be to be compatible for him to be the real father? Please help!!!

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    • Your daughter’s father would have blood type A+, B+, AB+, or O+.

      Hope that helps.

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  8. Edward Hines

    My mom is O+ and dad is B+, how can I be A+, help please?

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  9. Glen

    My parents and brothers and sisters are all O type not sure about pos/neg. Why am I AB positive? Is there something my parents should tell me?

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    • C

      Maybe there’s something at least one of your parents should be telling you. And your dad. :)

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      • Before jumping to conclusions, you may want to consider a few key questions:

        • Was I wanted?
        • Do my parents love me?
        • Will it hurt my father if I open this can of worms?

        You may have been a much desired child that your parents were able to conceive with the help of a sperm donor.

        Or one of the three tests may be wrong.

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  10. sabillah

    My parents both are o+ and mine is B+. Is that possible? I’ve been wondering.

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  11. nav

    sir…i am having AB positive bloodgroup and my wife B positive bloodgroup and my child O positive ..is this possible??

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  12. Chris

    I saw a case where both parents are O+ but all their children are A+. How can i reconcile these?

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    • Pat

      Both my mom and dad are gone, both of them are 0 positive, including my brother , but I am A Positive

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  13. marwan john

    am b negative and my wife o negative it is posssible we have a positive child ???

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  14. Shirley

    Father A negative Mother O Negative child A positive. Is it possible this man to be the dad?

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    • Ashleigh

      YES… II just had my son 2 days ago… I am A- and his father is O+… Our son is A+… A type is dominate over O type and when you have a – + combo the + is dominate… So you would end up with an A+ Baby…

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  15. Courtney

    My mother is ab negative and my father is o negative. I’m o negative. How is this possible if an ab blood type can’t parent a o blood type?

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  16. Mainlay Jasn

    Suresh Mathur … My mother is O+. My dad is O+, but I’m O-. My little brother is O+.
    So, you’re wrong.

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    • Alexis Brown

      He is not wrong however, you are mistaken. Each person has 2 RH factors either ++, +- or –. He explained all variables in his examples.

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      • Courtney

        Mainlay was speaking to someone who commented and was wrong. Js.

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  17. Suresh Mathur

    Hi,
    Me and my wife both blood group is O+, and my new born baby boy also O positive.
    I think that if parent are O+, all baby will O+.
    Thanks Doc For nice article.

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  18. Liana Hernandez

    Hi my blood type is A + and my husbands is A- so when our child was born she was an O + . We took a DNA test to confirm which proved this can happen.

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  19. patty balser

    If I have RHO negative blood, what would my parents blood have to be?

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  20. subir dutta

    my blood groupe is A ..and my wife is B …but my son’s groupe is O ..is it possible

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    • Alka Gupta

      Yes.. It it is possible coz u have A group means u r carrying A nd O gene nd ur wife have B group means she is carrying B and O gene…so ur baby can take one O from u nd another O from ur wife nd ur baby’s blood group vil be O

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    • davidpaulabraham

      My wife and i are 0+ what is my baby blood group???

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    • Srinivas

      Mother A positive,Father B positive.child O negative.Is it possible

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  21. mich

    Hallo

    Can a baby’s blood be B+ if the mother is A- and the father is type O (not sure if – or +)?

    Please help.

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    • Harsha

      I just saw your query…..i am not good at biology it cannot be possible to have B+ if parents are A- and o(+ or -)….you just refer to this link http://www.endmemo.com/medical/bloodtype.php ….. the result i got is NO

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    • Alka Gupta

      No it is not possible… One of the two parents must have B gene … Otherwise it is not possible.

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  22. tyshauna joiner

    Can o positive people have a healthy baby?

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    • anita k

      We are both o+. Won’t our baby have difficulties in health?

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  23. Rajesh p

    Docter I am simply verifing my blood group is O positive and wife blood group is B positive but my baby is b positive it is possible sir

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  24. yash

    THANK YOU SIR I HAVE FOUND THE ANSWER FOR MY QUESTION IN THE ARTICLE BLOOD TYPES 102

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  25. yash

    Sir,I have a question my cousin’s parents are B+ and my elder cousin brother has B+ but the case of his younger brother he has O+ IS THIS POSSIBLE ? Please reply to this on my mail address.
    THANK YOU

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  26. chantelle

    As I understand I was a “blue baby” during birth and needed an emergency blood transfusion.

    My Mother is A+
    My Father is A+
    But I am AB+ (this is impossible because two A… cant produce an AB)

    Can this be caused due to the blood transfusion that I receaved after my mother gave birth to me?

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  27. Aaron Forrest

    Hi my mother is o negative. I don’t know what my fathers blood type is, but mine is ab positive. Research I have done on the internet says this is impossible. Can some one please explain?

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    • Courtney

      Your father might have ab blood. it does say an ab can’t parent an o

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  28. Kyle

    Both the wife and I have O+ blood. How can we have a baby with A-? I understand that we both are (+,-) so we can have a child that is O- but how is it that the baby is A? The doctor told us that this is very rare. I just want to understand how.

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    • Becky

      I am very interested in any answers you find on this subject, Kyle.

      I am very obviously not adopted, but just recently I found out that both my parents are type O (dad is O+), two out of three siblings are O+ (one sister doesn’t know her type), and all three of my children are O+. I am type B (I don’t know whether its positive or negative). To my knowledge I’ve never had a blood transfusion. Everything I’ve searched online states that this is not possible.

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      • Fiona

        I’m very interested in what you have found out as well. Both of my parents are O+ and I am B+. I’m just very confused as from my very basic Biology it’s not possible?

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    • Sabrina

      Same has happened to me and my husband. He is o- and I am o+ but our daughter was born A+. I hear about this happening in many other cases.

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  29. Jules

    Hi my mom is an o+ and my father is a b- and I found out during the labs for my pregnancy that I’m an a+. That isn’t possible is it?? I have other reasons to be suspicious but does medically prove that it is impossible for them to both be my biological parents?

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  30. Anushree

    So my mom’s blood group is B-ve while my dad’s is B+ve, but I’m AB+ve. They say that in rare cases it is possible for the blood group not to match, but I’m still skeptical about it. Can you help?

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  31. Katie webb

    My blood type is b-and my twins are o-my ex husband doesnt think he is the father but his blood type is o- as well could that mean he is the dad

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    • Tish

      I’m O- and my son is O-, my husband is O+, there is no question he is from us both as he was born by in vitro fertilization.

      Ha ha — unless he was ‘switched’ at birth, but highly unlikely-he looks like both of us no doubt.

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  32. "M"

    My mom is A+ , my sister is O- and I am B-. Is this possible and so we have the same dad?

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  33. love

    What about pregnancy if my blood group is b- and my wife o+?

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  34. Rajesh p mysore

    Docter sir I’m confused. My blood group is O positive and my wife’s blood group is B positive and my son blood group is B positive. Is it possible?

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    • Henk

      Yes, this is possible.
      The gene types of blood group B are BB and BO. The gene types of blood group O is OO. Your child must have gene type BO (the B inherited from your wife and the O inherited from you) making him having blood group B.

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  35. sai

    If you have parents with same O+ blood, would it be possible if they bear an A+ offspring? Please answer because I really want to know if I am really their daughter.

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  36. Larry Richardson

    Hi Dr. Greene.

    Both of my parents are deceased. When my mother was alive, she told me she had the rarest form of blood: AB negative. My father’s dog tags, from the military, indicate that he was O positive.

    From photographs and time sequences for conception, there are doubts that the man I called father is really my blood father. The disparities in physical characteristics, the manner in which we were treated growing up, and our psychological makeup are extremely distinct. My brother was the first born, and has blood type O negative. I am O positive.

    I am now 71 years old and only wish to verify if or not I was the love child of another second lieutenant while my father was in amphiibious training for the Normandy Invasion on D-Day.

    I have asked my brother if he talked about it with my mother since I left the house at 18 years of age and never returned until 20+ years later. He and my mother were best buddies and often palled around together. He says she never spoke of it. When I bring up the subject of how different we are in every aspect of our lives (physio, psychological, upbringing, etc.), he simply dismisses the subject with, “What does it matter?”

    Although I am an engineer, I have difficulty understanding the biology of blood types and Rh factors. Biology was not my forte in college!

    Thank you,

    Larry Richardson
    Los Lunas, NM

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    • Lucy

      Hi
      I am not an expert, but from what I have been reading about blood types, I think your mother was mistaken in saying she was AB negative…
      To have O children she would have to have an O in her genes, for example she would have to have been AO or BO.
      An AB mother would produce either an A or B baby I think…
      I could be wrong but this is my understanding.
      Maybe you could check this specific fact out.
      Lucy

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    • Sam

      Larry, perhaps I can hep put you mind at ease. I have the exact scenario in my family, and this is how a geneticist explained it to me. “This reminds me of a case in Japan. There an AB man and his O wife had an O child. Lots of research later, the researchers showed that he had his A and B genes stuck together on one chromosome and a “blank” spot on the other. What that means is that he could either pass AB to his kids or O and so with an O wife, he could only have O and AB kids.Another possibility is that dad has a really rare blood type called Bombay. These folks look O but genetically can be any blood type. If this were the case, then you and your brother might have the same blood type. Like I said, this is extremely rare.”

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  37. Rock

    My blood type is A negative my father is O rh positive what can my moms blood type can be and please what if both my parents have O positive are they really my parents please answer I am worry about:!?

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  38. Connie Jones

    Hi Doc: My brother and I are adopted and have been told that we are both from the same mother. Birth mother says, No, that she miscarried a boy before she had me out of wedlock… Long story..
    My question to you is..Can a sibling with A+ blood type and the other sibling with O- (Me)…be related?
    Just curious. Thank you..

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  39. Bridget

    i am confused …OK i have O- blood type and my Husband thinks his is A+(from blood test he did back in high school ).. we have 5 children all are O- so is that possible or is he really A-

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    • KIMBERLY ROBBINS

      I am trying to figure out the same thing during this pregnancy because I am trying to avoid getting a rhogam shot if my husband is positive, however, my husband is not sure whether he is positive or negative. I am O negative and my husband is A (something). All my kids (3 of them) are O negative as well.

      If your husband is positive, he could be ” ++ ” or “+ – ” which would still make him positive. If you are negative, then you are ” – – ” So, when you you do the calculations, your kids have the possibility of coming up “AO” which is simply “A”….OR….”OO” which is simply O. This is because you both pass on one letter to the child. For your kids to be O and your husband to be A, he HAS to be “AO”.

      As for the RH factor, he HAS to be “+ – ” so he can pass on a negative to the kids just like you. That would allow them to be O negative. So, yes, it is possible for him to be positive.

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      • Rajesh

        Docter I am simply verifing my blood group is O positive and wife blood group is B positive but my baby is b positive it is possible sir

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  40. san

    My blood group is O+. My wife’s blood group is B. My son’s blood group is AB. Is that possible?

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  41. sravanthi

    Both of my parents are B positive and I am B negative. This is possible?

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  42. Freda Arthand

    My daughter and I have the same blood type — O positive. Her dad (I think that’s he dad) has AB. We did a swab test and it was suppose to be her dad. However the guy I was with also had O positive blood. Could it be possible that the other guy is the father to my daughter? The one with ) Positive blood?

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  43. JC

    My sister is an O blood type. My mother is AB and my father is O. Is that even possible? Are they my parents or am i adopted?

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  44. patrick clancy

    if you have two parents one with o- blood and one with o+ positive blood is it possible to have two siblings with O negative blood and the other with o+positive

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    • Henk

      Yes, this is possible. Rhesus positive can have gene type ++ or +-. If one of your parents have +- and produce a child with a — gene type (Rhesus D negative; see explanation by Dr Greene), siblings can have both +- (Rhesus D positive) and/or — (Rhesus D negative).

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  45. Lisa

    Both my parents are O, my two siblings are O, but I am A. Is this possible?

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    • April

      No, two O make O

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  46. Ann

    What does it means if the baby have a A+blood type, and the mother is o and the father is o. A little confuse. Can you give me the answer
    Thank you

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    • Migdalia

      Doctor I don’t understand why my child came out with A+ blood type but me and my spouse have O+… Please help

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  47. mical

    Dear Dr….me and my wife are A positive …what shall my children blood group. ? I really like to know. .Thanks

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  48. Alexis

    I’m becoming concerned whether or not my parents are my biological parents. Everyone in my family has O++ blood and I’m O-, plus I don’t resemble any family members. I don’t know what to do?

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  49. Gyasi Dennis

    Both my parents have type O,but i have type B-,please is it normal?

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  50. Ashley Chambers

    Okay i need help understanding i am not sure of mine or my parents blood types i do know my sister is o begative with rh negative does this mean i too will be rh negative.? My next question is i have been cleared from a dr saying i have no fertility issues as has my husband but in 8 years were not parents yet is it possible that our blood types could be not compativ
    ble causeing us not to be able to get pregnant?

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  51. TheOtherRosie

    That sounds simple enough. Parents each have 2 genes that determine the blood type of their offspring. Each parent shares only 1 of their 2 genes with their offspring. The dominate gene determines the offspring’s blood type. I’ve been out of college for a long time. I didn’t have much science in college, but I’m making up for it now. Enjoyed your article very much. Genetics is so very interesting. Thank you for sharing. : )

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  52. now confused over bloodtyping

    ok, my first husband was O+ and so am I , our child is O-, my second husband is A+, me O+ and our child is A-… how is this?

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    • kim

      You = O + – (positive is the dominant gene and negative recessive)

      First husband same.

      You both gave your recessive gene to your child.

      Second husband will have to be A+ –

      Your second child will be AO blood type (A being the dominant and O recessive) and like your first husband you both gave your recessive – to your child.

      Hope this helps.

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  53. Jacqueline Gardiner

    I remember talking with ny genetics instructor about this. Both my parents are rh positive. My Dad had issue believing I was his because I’m rh negative. Initially she said no, its not possible for two positives to have a negative. My heart fell through my stomach. As I turned to walk away she yelled “wait a minute!” I learned that one of them carries the recessive gene. Pretty cool stuff.

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  54. Ravi Bhatia

    my son is ab positive , me & my wife are both b positive. is it possible?

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    • Cody

      I don’t think so. To have a b type blood you have to have two genes that are either BB or Bo. If two people make a baby that have B type blood it is either BB+BB or Bo+BB or BB+Bo or Bo +Bo. There is no A in the mix to make AB child.

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  55. kat

    Okay, my parents are rh+ both of them. what would i be?

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  56. april

    My blood type is B- HR what would my parents blood types be?
    I have 2 kids and they both have AB+, I was given the rhogam shot during and after both my
    prengnecies, why?

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  57. Chris

    Please help…. I’m confused,.. My blood type is B positive and my mothers is A negative, is this possible ?

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    • Michelle Patterson

      Yes. Your father must have been B positive. Everyone actually has TWO letters (one from each parent) and TWO Rh signs. So since you are B+ you are either BO++ or BO+- (BB++ or BB + – would also be type B+ but that can’t be you, because of your mother she had no B to give you or it would show in her blood type. ) Your mother, being A- is actually either AO– or AA– She could have given you the O. Obviously she didnt give you a B, which is why you are BO not BB.) If she had given you the A you would be type AB. So she gave you the O. She definitely gave you the – since she only has – – . So she gave you O – and your father must have given you B+ which means you are BO+- which would be interpreted as type B+

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  58. anne

    helloo,i had a question pls kindly give me an answer .Is it normal that the father ,mother ,and a daughter had same blood types?coz one of my friend family they had all O POSITIVE blood types.

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  59. Emma Lane Davis

    i am in my first pregnancy and my blood type is A- and i have Rh- blood yet my mother has A+ and my Dad has O+ and they are both Rh+. my dr tested my blood thats how i know i’m A- and Rh-. but i don’t understand how this is my blood type and my parents are both positive.

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    • Cody

      For you to have A- blood your parents would both have to have receive Rh-. So your mom could have AA+- or Ao+- and your dad would have oo+- .

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  60. jayson

    hi my parents are both os and i’m ab are they my really parents?

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    • Marisol Torres

      I am a mom that has O- and my husband has O+, both of the kids that I gave birth to are AB+ Even though teachers have asked our kids if they were adopted, my kids know they were not adopted. So it is possible! I guess rare, but possible ;)

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      • jayson

        thank you :)

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        • Marisol Torres

          You are welcome!

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  61. Julie Balfour

    My mum is 0+ I am 0- what blood type could my father be?

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    • Kezia Elizabeth

      B, A or O positive or negative

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  62. Joanne Jackson

    My mother is B I don’t. Know positve or negative my dad is a postive but I always thought my step dad which is o postive was my dad is it possible?

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  63. Heather Hylemon

    I have a question both my parents are o blood type but im a+ an my sister is o as well how is that possible

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  64. Stephen Maria Jarrells

    My dad is an O- my mom is an O+ but I am absolutely B- Rh-…does anyone have an answer? My mom refuses to talk & unsure what hospital i was born my dad says he’s my dad and dont mind a blood test. Plz help

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  65. lorraine wallace

    I am o negative reh both my parents are b+ how is this possibly. ???

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    • Cody

      O and Rh- are recessive genes. Even if someone has them it will not show in their blood type unless they have both of them. So your parents would have to be Bo+- for you to be oo– which is O-.

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  66. Jannette Davidson

    Both my parents are O+, so are all my siblings. I am A+ and my mother swears she never had an affair. I also have very dark skin, no widow peak, and unattached earlobes. Please figure that one out.

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    • Here is more information for you from Dr. Greene –http://www.drgreene.com/unders… One thing to to consider, your blood type could be an error. Before you go any further, consider having your blood type re-tested.

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      • Jannette Davidson

        I am sure my blood type is correct. I don’t think the U.S. Army, the V.A. hospital and all the times I have donated blood could be wrong. We all know out blood type from getting tested when my grandpa and step dad needed to find a match for kidney disease. From what I gather there is a thing called a genetic mutation, can this be the cause?

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        • I don’t know if it could be genetic mutation. That’s a great question. Does anyone else here know?

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          • R Quispe

            According to the following website there is still a very very small possibility of genetic mutation

            http://genetics.thetech.org/ask/ask181

            However, if you are still unsure, only a DNA test will give you peace of mind.

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  67. desteny

    I have a question my sister had her period on novrmber 8 on the 14 she have relationship with one man on december 11 she was in another relation with someone else in january she found out she was pregnant acording to the doctor she consive on december 27 and her due date september 19 she had the baby premature she is A positive the father is Rh o positive and the baby is o positive can that happen

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  68. april

    Hi there,
    Me and my sister are 1yr. and exactly 18 days apart same mom and dad. We have blood type RH O negative and we both have to take the RohGam shot. Now I was told by an RN that it’s impossible for us to be from the same parents and have this blood type. That only one child will come out with RH O negative. Is this true???

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  69. Me Trost

    Question: I am Blood Type O+ and my Brother is Type A+. What Blood Type combination(s) would our parents (RIP) have to of had for me (Sister) to be O+ and Brother to be A+?

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  70. Noelito Zipagan Glorial

    pls answer, how about parents with O type, and the child is A??is this possible??pls answer

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  71. Rose

    I am A-, my sister is A+, my brother is O+………is it possible that we have the same mother and father? There are doubts that we have the same father. We think we have the same mother but our father is the ?

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  72. Cheryl Boisoneault

    I am RH-A negative . My Mom is O positive and my Dad is B positive …How did this happen?

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  73. rj

    hi good eve. i have a question regarding my blood type my parent is A blood type me is B negative is it really my parent

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  74. Mohammed Mubeen

    Hi, i hav a question that my blood group is AB and Rh positive and my wife is O+ and Rh negative so what will be the result for this…?? and if she has O= and Rh positive then what will be the result…??????

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  75. Miranda Decker

    Here’s an odd one. My parents are both o+, so is my sister… I am A negative. So… I’m really starting to wonder how this would be possible….

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    • Cheryl Boisoneault

      Same here did you get an answer? my parents are positive to and both my brothers as well None have A blood…Or are they negative..my blood type is A negative RH ? I would love to know how this happened

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    • Mela

      My parents are both 0 + , me and my brother are 0 – . And its totally fine because 0+parents can only give birth to babies with 0+ or 0 – blood type. In our case it happened to be 0- . :)

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    • Charla Satterwhite

      Miranda, did you ever find the answer to your question? Because I need to know the same thing.

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      • mariya

        My blood group is a positive and my husband o positive. But our son o negative. Is it possible. ?

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        • Mariane

          I am A+ and my husband is O+ and our son is O- too. This is possible so don’t worry.

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  76. Miss Jennie

    My dad belongs to B type blood and my mom belongs to O type blood, whereas my brother belongs my dad’s blood type but how come my blood group is A positive?

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  77. Peggy Robinson

    Can a RH Negative and A O Have a A positive Child?

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  78. Peggy Robinson

    Can A RH Negative And a O Have an A positive child?

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  79. Miriam LuvEtte Saucedo

    My parents are both B+ … Why am i A+?

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    • Subasis Mishra

      Is it possible that baby having A+ve if both parents have B+Ve blood group?

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  80. Nean

    my mother has 0 Negative RH blood group – bit of confusion as my fathers dog tags of 1947 simply have 04 blood type…he told me they both have RH O Negative…and his is rare – I am O Positive – born in 1958 in an out back town in the Northern Territory where blood transfusions for the baby be non existent…very confused…my younger brother definitely theirs RH factor child severe anger issues, learning difficulties speech, tactile…I am 55…my parents told me I was adopted they are both in their late 80’s and with cancer I am their carer mum is now in full time care…could you please tell me is it possible for two O negative Rh blood groups to have children…my brother is fine now but was an out of control toddler and child and violent…thanks so much they do not wish to discuss my adoption which is fair enough.

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  81. island boy

    Hello, I have a question. Can both parents with type O blood produce a type A+ child? Both my parents are type O and i am type A+. Switches in the hospital can happen to where i am coming from. Please help!

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    • Huckle_Cat

      I think he answered this question in the paragraph where he says, “if two parents both have type O blood, all of their children will have type O blood.” That is because they can only pass on a type O gene to their children.

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    • Jaclyn Elaine

      My parents are both o+, and me and my twin sister are ab+ so we have been wondering this as well. There is no question of paternity or switching at birth as we are splitting images of our parents, and we are pretty confident in the results of the blood tests

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    • Michelle Patterson

      No. If both of your parents are type 0, they could NOT produce a type A child.
      It is possible that either one of the three of you is incorrect about your blood type. It is still possible they are both your parents if either of the three of you is incorrect about your blood type. Or possibly one of them is not your parent. If you are 100% certain you are type A then you HAD to get that A from one of your biological parents, either your father or mother. Your mother could be type O, but then your father would have to be type A, or vice versa

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