A couple are both heterozygous for the dominant allele for polydactyly. They want to have three children. What is the probability that all three children will have polydactyly?
A) 3/4
B) 9/64
C) 1/64
D) 27/64
E) 1/2

Question

Quizplus · Accepted Answer

The probability that a child will have polydactyly when both parents are heterozygous is 3/4. For three children, the probability is (3/4)^3 = 27/64.

A Couple Are Both Heterozygous for the Dominant Allele for Polydactyly