Ask Dr. D'Adamo

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Questions of A More Technical Nature

Type AB Dad, Type O Mom, Kids ?


Hi! I am AB and my wife is O what will my childrens group be?


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.

The Ask Dr. D'Adamo internet advice column ran from 1996 to 2009, at which time Dr. D'Adamo's teaching and programming responsibilities no longer allowed him to devote time and resources to directly answering visitor questions. However we've recently reorganized this treasure-trove of material and made it again available to his readership. He occasionally posts new entries. These are marked with a NEW tag.

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