Codominance occurs when both alleles are expressed equally in the phenotype. This means that neither allele fully masks the effect of the other – both are observed in the phenotype. For example, in a heterozygote with one allele for red flowers and one allele for white flowers, both colors may be expressed equally in the flowers, resulting in a phenotype with both red and white coloring (e.g. pink).

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Codominance Is When

Question 69

Multiple Choice

Codominance is when

A) one allele masks the effect of the other in the phenotype.
B) both alleles contribute equally to the phenotype.
C) an intermediate phenotype is expressed in the heterozygote.
D) more than one gene contributes to the phenotype.
E) the environment contributes to the phenotype.

Correct Answer: