The probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is
A) 50 percent.
B) 0 percent.
C) 100 percent.
D) 25 percent.
E) 75 percent.

Question

Quizplus · Accepted Answer

When both parents are carriers for an autosomal recessive disorder, there is a 25% chance the child will be affected, a 50% chance the child will be a carrier, and a 25% chance the child will be unaffected and not a carrier. Therefore, the probability of producing a normal (unaffected and not a carrier) child is 25% + 50% = 75%.

The Probability of Producing a Normal Child by Two Parents