How is Codominance Expressed in an Organism

Question

How is codominance expressed in an organism?
A) Both of the alleles in a heterozygote are expressed phenotypically in an individual.
B) Expression of two different alleles alternates from one generation to the next.
C) A heterozygote expresses an intermediate phenotype.
D) Offspring exhibit several different phenotypic expressions of a single trait.

Accepted Answer

Codominance is expressed when both alleles in a heterozygote are expressed phenotypically in an individual. This means that neither allele is dominant or recessive, and both contribute to the phenotype in a visible way. One example of codominance is the AB blood type, where both the A and B alleles are expressed and there is no visible dominance between them.