Could a man with an AB blood type be the father of a child with type O blood?

Answer

A man with type AB blood cannot be the father of a child with type O blood. A child with type O blood would have to get the O allele from both its father and mother.

In the ABO blood typing system in humans, three types of alleles, or forms, of the blood type gene exist: A, B and O. Having type O blood is a recessive trait that requires two O alleles. The A and B alleles are codominant, so both are expressed. Each person can inherit only two alleles, one each from both mother and father. A man with AB blood can only pass on either the A or B alleles to his offspring, not an O allele.

Reference:
Q&A Related to "Could a man with an AB blood type be the father..."
3. 50 percent. Let's take all the possibilities: Man=OO (this is the only O genotype possible) Woman=AB. Child is either AO or BO. O means no antigen, so the phenotype of AO is A
http://answers.yahoo.com/question/index?qid=201011...
If a man who is type AB mates with a woman who is type O,
http://www.chacha.com/question/if-a-man-who-is-typ...
Answer 1. mmk well first split it up into the the genes. man: A , B. woman: O , O. then put in onto a 2 by 2 box, the man on the top and the woman on the left (can be switched) so
http://www.helpfulbox.com/ans/Mathematics_Science/...
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