yeah man the only way this is possible is if your mom cheated on your dad. Sorry man but your mom i a *****.

AHAHAHA that's the same with me.. my father is an O positive and my mother claims she's a B. but my recent blood test says i'm an O positive.. this after my father told me my stepmother isn't my real mother, this B blood type lady is my real mother. my father. is. a. *****.

The same thing happened to my friend, this was how he found out who his really dad was.

#206, you're either really retarded or intentionally trying to confuse people. What does that even mean, "B overlaps O"? That doesn't mean anything. #210, you confuse me. If your mother is B and your father is O, there's no reason you couldn't be O as well. #195 and #197 sum it up very nicely, but it's not a "grounding protein" that's missing--it's a fucose group off the glycoprotein. Because that group is missing, neither A nor B antigens can be expressed, regardless of whether the genes say they are there. In conclusion, it is possible for the O parent to be secretly BO or BB (if at least one of that parent's parents are B or AB), but it is somewhat unlikely. It's more likely that the mother cheated, that the child is adopted, that the blood type test was wrong, or that the results were remembered incorrectly. The least likely option is that the child is a mutant on its own.

I would consider it awesome if something like that happened to me!

as long as they love you, who cares.

People... It's been statistically shown on BBC news that 5% of children born worldwide...are born and live in families in which they aren't related to the father. Not placing the blame for unfaithfulness on women as it DOES take 2 to tango!

Wow it's amazing how many people assume Google makes them experts on something they're not. If you haven't studied genetics on at least an undergraduate level, stop embarrassing yourself. It's very simple. A/B/O alleles follow fairly simple genetics (AB are codominant, and each are dominant to O), but there is a FUT1 gene (associated with the "Bombay phenotype") that can override the alleles present at the 'normal' blood type genes. Basically, it is very possible both your parents are heterozygous for the Bombay allele, meaning that they are both carriers. If you inherited this recessive allele for both, you will express the associated phenotype. And the Bombay phenotype OVERRIDES whatever alleles you have at A/B/O, because expression of the Bombay phenotype prevents production of the A and B antigens EVEN if you have the A or B alleles. So it's very possible. You could have the regular A/B/O alleles from your parents, but if you have the Bombay phenotype you'll be phenotypically type O even though you possess the A/B alleles.

To be clearer, here's what likely happened (assuming your parents didn't cheat): -The Type A parent has the genotype: AO -The Type O parent carries a B allele (either BB or BO) but is homozygous recessive at the FUT1 gene, meaning that parent has the Bombay phenotype. In other words, this parent still has the B allele but appears Type O phenotypically because of the Bombay phenotype. -You inherited the B allele from Parent 2 and the O allele from Parent 1. You also received a normal (wild-type) allele for the FUT1 gene from Parent 1, so you do NOT express the Bombay phenotype. Therefore you fall back to the normal blood type genes, where you are likely BO, resulting in Type B.

thats ******!