Q. Four children belonging to the same parents have the following blood groups A, A, AB and O. 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
Explanation
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, i.e., the genotype of one parent is $I^{A}I^{O}$ and of other is $I^{B}I^{O}.$ [image:5d_image7.jpeg]
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.