Question

a man with blood group A marries a woman having blood group A B which progeny of this couple would show that the man is heterozygous

Answer 1

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So as I have to say the guy is heterozygous hence his blood group will be AO (o is recessive and hence doesn't get to express) . He mates with AB hence possible genotypes are AA,AB,AO,BO. So, here BO if expressed in child means that B came from the AB and O came from A blood group. If BO is not present as an option it means that the A blood group is homozygous(same gene AA) .

Hope that helps  sorry if my answer is wrong

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