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.
A
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A Each child born to a couple who carries an autosomal recessive trait has a 25%
chance of having the disorder, because the child receives either a normal or an
abnormal gene from each parent.
B If one member of the couple has the autosomal recessive disorder, all of their
children will be carriers. If both parents are carriers, each child has a 50% chance
of being a carrier.
C The child has a 25% chance of being affected and a 50% chance of being a
carrier.
D Each child has the identical odds of being affected. Because both parents are
carriers, each child has a 25% chance of being affected, a 50% change of being a
carrier, and a 25% change of not having the gene transmitted.
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