C is a dominant gene for a cleft chin, and c is a recessive gene for not having a cleft chin. If a cc genotype parent reproduces with a CC, what is the phenotype of the offspring?
A. All have a cleft chin.
B. 25% have a cleft chin, and 75% do not.
C. None have a cleft chin.
D. Half have a cleft chin, and half do not.
