Question

The ABO blood groups in humans are expressed as the IA, IB, and i alleles. The IA allele encodes the A blood group antigen, IB encodes B, and i encodes O. Both A and B are dominant to O. If a heterozygous blood type A parent (IAi) and a heterozygous blood type B parent (IBi) mate, one quarter of their offspring are expected to have the AB blood type (IAIB) in which both antigens are expressed equally. Therefore, ABO blood groups are an example of:

a) Incomplete dominance
b) Codominance
c) Multiple alleles
d) Sex-linked inheritance

Answer 1

The ABO blood groups in humans are an example of codominance and multiple alleles. In this case, the IA and IB alleles are codominant and both dominant to the i allele, resulting in the expression of both A and B antigens in individuals with AB blood type.b) Codominance

Step-by-step explanation:

The ABO blood groups in humans are an example of codominance and multiple alleles. Codominance is characterized by the equal and simultaneous expression of both alleles, while multiple alleles refer to the presence of more than two variations of a gene in a population. In this case, the IA and IB alleles are codominant and both dominant to the i allele, resulting in the expression of both A and B antigens in individuals with AB blood type.