Question

A man is heterozygous with a cleft chin (a dominant trait that obeys Mendel's first law) marries a normal-chinned woman and they have 10 children, all with cleft chins. What is the probability that the 11th child will have a normal chin

Answer 1

50%

Step-by-step explanation:

If the male has a cleft chin, that means that his chromosomes is Aa. His wife must be aa.

Female Female

Male Aa Aa

Male aa aa

With Aa, the child will have a cleft chin. With aa, the child will not. So the probability is 50%.