Question

A person has type A blood group while his wife has type B, they have
four children each with different blood group of ABO system. Explain that how is it possible?​

Answer 1

Answer:

Blood group A and B parents can have off-springs with blood group A,B,AB and O depends on the zygosity. O group child comes only when both the parents are heterozygous ie. AO , BO. If both are homozygous, AA x BB, only AB children can be expected.If one of them is heterozygous and the other parent is homozygous, AB group and the same group as of the homozygous parent can be expected in the child. Eg. AA x BO= AB,AO. BB x AO= AB,BO.