Ian and Bryony are both carriers for two autosomal recessive disorders,PKU (chromosome 12)and cystic fibrosis (chromosome 7).They are expecting a daughter.What is the probability that she will have PKU but not CF?
A) 3/4.
B) 9/16.
C) 3/16.
D) 1/2.
E) 1/16.

Question

Quizplus · Accepted Answer

The probability of the daughter inheriting PKU is 1/4 (since both parents are carriers), and the probability of not inheriting CF is 3/4. The combined probability is 1/4 * 3/4 = 3/16.

Ian and Bryony Are Both Carriers for Two Autosomal Recessive