Question

A gene showing codominance has

• A. alleles tightly linked on the same chromosome.
• B. alleles that are recessive to each other.
• C. both alleles independently expressed in the heterozygote.
• D. one allele dominant on the other.

Answer 1

Answer: (C)

Both alleles are independently expressed in heterozygote during codominance. In codominance, the alleles of a gene pair are fully expressed resulting in offspring with a phenotype that is neither dominant nor recessive. Example: $ABO$ blood group system.