The difference between a homozygous trait and a heterozygous trait is that a homozygous trait ___ and a heterozygous trait ___.
A) will always be expressed in the phenotype; may not
B) will be expressed in the phenotype if there was proper environmental exposure during the critical period; does not have a critical period
C) is always recessive; is always dominant
D) is usually discrete; is usually polygenic

Question

Quizplus · Accepted Answer

A homozygous trait means that an individual has two identical alleles for a particular gene, while a heterozygous trait means that an individual has two different alleles for the same gene. In most cases, homozygous traits will always be expressed in the phenotype, while heterozygous traits may not be expressed if the dominant allele masks the recessive allele.

The Difference Between a Homozygous Trait and a Heterozygous Trait