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QUESTION: Hi! I am AB and my wife is O what will my childrens group be?
ANSWER: Here's an interesting combination: Blood type O and blood type AB parents. In this circumstance, the offspring will either be blood type A or blood type B as both the A and B alleles are dominant to the o allele. Thus in this scenario no offspring will possess the blood type of their mother. Both will possess a recessive o allele (in addition to their dominant allele) which they may pass onto their own offspring and use to produce blood type O offspring. Grandma's revenge!
This is why recessive genes do not disappear over time: There are enough o alleles in the human gene pool to allow blood type O to propagate into the foreseeable future.