In ____, a pair of nonidentical alleles affecting two phenotypes for a given trait are both expressed at the same time in heterozygotes.
A) pleiotropy
B) polygenic inheritance
C) complete dominance
D) codominance
E) a multiple allele system

Question

Quizplus · Accepted Answer

In codominance, both alleles are expressed equally in heterozygotes, resulting in a phenotype that shows both traits. This is in contrast to complete dominance, where one allele is dominant and masks the expression of the other allele, and a multiple allele system, which refers to a trait in which there are more than two possible alleles that can code for it. Pleiotropy refers to a single gene affecting multiple traits, while polygenic inheritance refers to a trait controlled by multiple genes.

In ____, a Pair of Nonidentical Alleles Affecting Two Phenotypes