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
Ans:
A
Feedback:
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.
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