In people, a dimpled chin is an autosomal dominant trait. Many famous celebrities, such as John Travolta and Michael and Kirk Douglas, have this condition. Assume that the wrestler and actor Hulk Hogan is homozygous for the dimpled chin, and he married a woman with a round chin. They had two children, Brooke and Nick. What is the probability that their children will show the trait?
A) 50%
B) 25%
C) 0%
D) 100%
E) 75%

Question

Quizplus · Accepted Answer

Since Hulk Hogan is homozygous for the dominant dimpled chin trait, and the trait is autosomal dominant, all of his children will inherit at least one allele for the dimpled chin, regardless of the mother's genotype (who has a round chin, indicating she does not possess the dominant allele). Therefore, the probability that their children will show the trait is 100%.

In People, a Dimpled Chin Is an Autosomal Dominant Trait