Blood type B?!? is it possible when my parents have A and 0?

Question

So I just found out that my blood type is B, but my mother is A, and my father is 0, is this possible??

As far as I remember from having learnt from school I could have only been an A or O?? Am I right??

I'm just kind of confused here....

Answer 1

Yes, you are right, A and O parents can't normally have a B kid.

999 out of 1000 time this happens, it because those test resutls are wrong...or you are wrong about who your parents are.

But maybe you are the 1000th case.

Answer 2

Never ever can be like this. Most probably you are facing a wrong blood test result. let's say:

AA x OO = AO

AO x OO = AO or OO

that's all.

Answer 3

Although I'd re-check everyone in your family, one possibility is that the "Bombay phenotype" is involved. Basically, the 0 - your father - could really be an A or - in this case - a B, but the routine tests cannot resolve this and "see" a 0 individual.

The difference between A, B and 0 lies in the type of sugar on the surface of the RBCs: As have "sugar A", Bs have "sugar B" (don't remember the names right now, could be mannitol) and 0s have none.

BUT...

The sugar that gives the A, B or 0 group is itself attached to an underlying molecule of sugar (let's call it sugar H). The gene that attaches this sugar to the cell membrane is called H. Some individuals instead have the 'h' that is nonfunctional and can't attach this sugar H, so they could be A, B or 0, but the corresponding sugar can't be attached on sugar H which is missing, so they always register as 0. A detailed discussion is at:

http://en.wikipedia.org/wiki/Bombay_phen...

So, if you father is a B (hetero-or homozygote, it doesn't matter) and omozygote for the 'h' gene, he passed you the B and h allele. Your mother is heterozygote A0 and probably homozygote HH, so she passed you 0 and H. You have a functional copy of the gene to attach sugar H onto RBCs, and a copy of the gene to attach sugar B on top of it, which is sufficient to make you a B.

Answer 4

No possible way.

If your mother is type A, her Genotype is either AA or Ao. If your father is O, then the only genotype that he can possibly have is oo. There is no allele there for blood type B.

So, either your blood test is wrong (this can happen if you did it in school, some blood tests through the school biology labs aren't completely conclusive), or one of your parents is mixed up about what kind of blood they have. Maybe your mother is actually AB, which could actually mean that you do have type B blood. Ask them about it.

Answer 5

It could be a Bombay phenotype. check this sites for more info.

http://anthro.palomar.edu/blood/Bombay_p...

http://en.wikipedia.org/wiki/Hh_antigen_...

Answer 6

No, you can't possibly have a bloodgroup of B. You can only be O or A.

So it's either a wrong blood test, your parents are incorrect in what their bloodgroup is, or someone's not your parent.