In humans, polydactyly (more than 5 fingers and toes on each hand and foot), is inherited in an autosomal dominant manner. What is the phenotype of an individual who is heterozygous for the mutant allele?

A. Wild-type

B. 5 fingers/toes on each hand/foot

C. More than 5 fingers/toes on each hand/foot

D. 5 long and 1 short fingers/toes on each hand/foot

E. Both A and B are correct.

C. More than 5 fingers/toes on each hand/foot

Explanation:

According to the given information, polydactyly is an autosomal dominant trait which means that the phenotype would be expressed in both homozygous dominant and heterozygous dominant genotype.

The given genotype is heterozygous dominant. The individuals with heterozygous dominant genotype would exhibit the polydactyly and would have more than 5 fingers and toes on each hand and foot.