Phenylketonuria is an inherited disease caused by a recessive autosomal allele. If a woman and her husband are both carriers, what is the probability that their first child will be a phenotypically normal girl?

Question

Quizplus · Accepted Answer

The probability of having a phenotypically normal child is 3/4 (since 1/4 will be affected). The probability of having a girl is 1/2. Therefore, the probability of having a phenotypically normal girl is 3/4 * 1/2 = 3/8.

Phenylketonuria Is an Inherited Disease Caused by a Recessive Autosomal