Question

a man with blood group a married a woman with blood group b.their first child with blood group o .work out the possible blood group in their future progeny?

Answer 1

Since their first child is having O blood group, both the parents are heterozygous for the blood group i.e. AO for man and BO for woman. Cross between AO and BO gives possible blood group in the progeny as A, B, AB, O.