A recessive allele affects an individual's phenotype only when it is present on
A) both chromosomes.
B) a single chromosome.
C) the same chromosome as a dominant allele.
D) a chromosome that is paired with one with a dominant allele.

Question

Quizplus · Accepted Answer

A recessive allele must be present on both chromosomes to affect an individual's phenotype, as it becomes the only expressed allele in the absence of a dominant allele. If it is present on only one chromosome, it may be masked by a dominant allele on the other chromosome.

A Recessive Allele Affects an Individual's Phenotype Only When It