A recessive allele will influence the expression of a trait only when it
A) is paired with another recessive allele.
B) forms a heterozygous gene combination with another recessive allele.
C) forms a homozygous gene combination with a dominant allele.
D) is paired with a dominant, but weak allele.
E) is contributed by the male parent.

Question

Quizplus · Accepted Answer

A recessive allele influences the expression of a trait only when it is paired with another recessive allele, forming a homozygous recessive genotype. Dominant alleles mask the expression of recessive alleles in heterozygous combinations.

A Recessive Allele Will Influence the Expression of a Trait