If a trait is controlled by two codominant alleles of one gene, what phenotypic ratio is expected in the offspring of a mating of two heterozygotes?
A)2:1
B)3:1
C)1:2:1
D)1:1
E)4:1

Question

Quizplus · Accepted Answer

In a cross between two heterozygotes for a gene with two codominant alleles, the expected phenotypic ratio is 1:2:1. This is because the offspring can be homozygous for the first allele, heterozygous (showing both phenotypes due to codominance), or homozygous for the second allele.

If a Trait Is Controlled by Two Codominant Alleles of One