Kirk is heterozygous for cheek dimples but is born with big dimples in both cheeks. Apparently, the allele for cheek dimples is
A) dominant.
B) sex-linked.
C) recessive.
D) polygenetic.

Question

Quizplus · Accepted Answer

The allele for cheek dimples is dominant, as indicated by Kirk being heterozygous (having one dominant and one recessive allele) and still displaying the trait. Dominant alleles only require one copy to be expressed in the phenotype.

Kirk Is Heterozygous for Cheek Dimples but Is Born with Big