A man of 'A' blood group marries a woman of 'AB' blood group. Which type of progeny would indicate that man is heterozygous ?

Step-by-step solution

From the above cross, it is clear that the occurence of B blood group progeny indicates that man is heterozygous for the allele (A ). If the man is homozygous for the allele (A ), the progeny will have either an (A ) or (A B ) type blood group.