question_answer

Four children belonging to the same parents have the following blood groups A, B, AB and Hence, the genotypes of the parents are

A)  both parents are homozygous for A group

B)  one parent is homozygous for A and another parent is homozygous for B

C)  one parent is heterozygous for A and another parent is heterozygous for B

D)  Both parents are homozygous for B group

Correct Answer: C

Solution :

In men, ABO blood group is best example of multiple allelism. The four children of blood group A, B, AB and O will be born if both the parents are heterozygous for A and B, ie, the genotype of one parent is\[{{\text{I}}^{\text{A}}}{{\text{I}}^{\text{O}}}\] and of other is \[{{\text{I}}^{\text{B}}}{{\text{I}}^{\text{O}}}\]