It is found that in cha-cha chickens, the allele for a double comb (A) is dominant to the allele for a single comb (a). A mother with the genotype Aa and a father with the genotype Aa produces an offspring.
What is the percent chance that the offspring will have a single comb?
A. 25
B. 100
C. 0
D. 75
E. 50
