By hedgehog5 - 11/4/2009 19:14 - United States
Today, I found out my blood type is B. My parents are type A and type O. It's not genetically possible to be blood type B if your parents are A and O. This means I am either an adoptee, a mutant, or an illegitimate child. FML
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  Gstone5  |  0

Too many negative votes, comment buried. Show the comment

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  dragead  |  2

um, ok, first off, you must not have payed attention during biology. A and B are both dominant, so it is impossible to have Ab blood and be and A blood type. It would make you AB type. duh.
Also, O is recessive, so if there was a B with the O, the blood type would be B. Check your facts before posting next time

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  MyraHem  |  0

hey 331, you're an idiot.

The phenotype A can either be expressed through genotypes AA or AO.
The phenotype O can only be expressed through genotype OO.

A and B both cause specific markers on blood cells. O does not. Therefore, AO only has A receptors and AA only has A receptors, making the blood type A. Same with B. The only way to get no receptors, blood type O, is to have the genotype OO.
Now that that's explained...

AA x OO yields:
100% chance of blood type A (AO, AO, AO, and AO)

AO x OO yields:
50% chance of blood type O (OO, OO)
50% chance of blood type A (AO, AO)

OP, you better hope your mother has a Bombay Phentoype, otherwise there's something your parents aren't telling you.

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Actually you can be their child; epigenetic's plays a huge role.
With blood types you have the up front genes Ia, Ib and i leading to the old type A, type B. type AB, and type O but before these proteins are made your body makes cells with organelles to make those proteins, if those are both recessive then no matter what they are type O even, if their genetically coded for Ib,Ib or homozygous type B. so if your dad was heterozygous for type A (Ia,i) you mom could hold the genes for Ib,Ib or Ib,I either way leading to a 50/50 for type B blood or type A.
This is known as the Bombay phenotype; you're not weird, you're not a Freak, and you're not illegitimate. :)
I was in AP Bio; I got a five.
Hopefully this helps.

By  Ron_fml  |  0

Too many negative votes, comment buried. Show the comment

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  saminess714  |  0

It's not possible. His parent would be BO not OB. O is always just O, but O can come after A or B. Unless one of his parents is AB or BO, it's not posible. The possible genotypes for A type blood are AA and AO. O is just OO. Therefore, if one of your parents really has O blood, they're OO. If your other parent really is type A, then they're either AA or AO. That means it IS impossible to have type B blood. Ask your O parent whether they're really O or if they're BO.