The Difference Between a Homozygous Trait and a Heterozygous Trait

Multiple Choice

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