Phenylketonuria is an inherited disease caused by a recessive allele. If a woman and her husband are both carriers, what is the probability that their first child will be a girl without phenylketonuria?

Question

Quizplus · Accepted Answer

Both parents are carriers (Pp), so the probability of a child without phenylketonuria (PP or Pp) is 3/4. The probability of having a girl is 1/2. Therefore, the probability of having a girl without phenylketonuria is 3/4 * 1/2 = 3/8.

Phenylketonuria Is an Inherited Disease Caused by a Recessive Allele