Knowing that persons with blonde hair exhibit the phenotype of a recessive gene, which of the following genetic scenarios would most likely underlie such a trait?
A) aa
B) A heterozygous pairing
C) Either AA or Aa
D) Different alleles at a gene locus

Question

Quizplus · Accepted Answer

A recessive trait is expressed solely in a homozygous pairing, such as aa. A heterozygous pairing, in which there are two different alleles at a gene locus, will not express a recessive trait. Aa is an example of a heterozygous pairing.

Knowing That Persons with Blonde Hair Exhibit the Phenotype of a Recessive