Both members of an expectant couple are carriers for phenylketonuria (PKU),an autosomal recessive disorder.In counseling them about the risk to their unborn child,the nurse should tell them that
A) The child has a 25% chance of being affected.
B) The child will be a carrier, like the parents.
C) The child has a 50% chance of being affected.
D) One of four of their children will be affected.

Question

Quizplus · Accepted Answer

When both parents are carriers of an autosomal recessive disorder like PKU, there is a 25% chance with each pregnancy that the child will inherit two copies of the recessive gene and be affected by the disorder.

Both Members of an Expectant Couple Are Carriers for Phenylketonuria