Question

Sol.(c) [Key Concept: Codominance — Both Alleles Expressed] A gene showing codominance has BOTH ALLELES INDEPENDENTLY EXPRESSED in the HETEROZYGOTE. In codominance, neither allele is dominant or recessive with respect to the other — both are fully and simultaneously expressed in the heterozygous individual. The heterozygote shows phenotypic characteristics of BOTH homozygous parents (not an intermediate). Classic example: I^A I^B individuals have both A and B antigens (blood group AB) — both alleles are independently expressed.