Question

Person having genotype I^A I^B would show the blood group as AB. This is because of ______.

Options

• Co-dominance

• Pleiotropy

• Segregation

• Incomplete dominance

Answer 1

Person having genotype I^A I^B would show the blood group as AB. This is because of co-dominance.

Explanation:

The blood group AB in persons with genotype IAIB is due to co-dominance. This occurs because both IA and IB alleles are expressed equally and simultaneously, resulting in the presence of both A and B antigens on the red blood cells. Unlike incomplete dominance where blending occurs, in co-dominance both traits appear distinctly in the phenotype. Hence, IA and IB are co-dominant alleles and both are expressed in individuals with genotype IAIB as blood group AB.