The presence of a recessive allele
A)can always be determined from the phenotype.
B)is usually masked in the phenotype.
C)is expressed in the phenotype alongside a dominant allele.
D)none of the above.

Question

Quizplus · Accepted Answer

A recessive allele is only expressed in the phenotype if it is present in a homozygous (aa) state. If it is present in a heterozygous (Aa) state, the dominant allele will mask its expression, resulting in a phenotype that appears identical to that of the dominant allele. Therefore, the presence of a recessive allele is usually masked in the phenotype unless it is present in a homozygous state.

The Presence of a Recessive Allele