An allele that needs to be present on only one chromosomal locus to be expressed is called a allele.
A) recessive
B) structural
C) dominant
D) phenotypic

Question

Quizplus · Accepted Answer

A dominant allele only needs to be present on one of the two homologous chromosomes in order to be expressed in the phenotype, while a recessive allele needs to be present on both chromosomes in order to be expressed. Structural and phenotypic are not terms used to describe alleles.

An Allele That Needs to Be Present on Only One