Question

A man with blood group ‘A’ marries a woman with blood group ‘AB’. The first child born to them has blood group ‘B’. Work out a cross to find the genotype of the father. Give the possible blood groups and their genotypes of the children that could be born to this couple. (Use a Punnet square).

Answer 1

The presence of B blood group progeny in the above cross suggests that men are heterozygous for allele A. If a guy is homozygous for allele A, his offspring will have either the A or AB blood type.