Question

The blood group of a child is 'O'. His father is with
'A' blood group and mother with ‘B' blood group.
Write, down the genotype of the child and
genotypes of parents

Answer 1

If the child has O blood group than it is evident that parents are heterozygous. Thus, the genotype of the father will be I^{A}i and that of the mother will be I^{B}i. The child having blood group O will have genotype ii. The other children may have genotypes I^{A}i (A blood group), I^{B}i (B blood group) and I^{A}I^{B} (AB blood group