Chapter 06 Genetics, Conception, and
Fetal Development Perry Maternal Child
Nursing Care, 6th Edition 2024
1. A father and mother are carriers of phenylketonuria (PKU). Their 2-
year-old daughter has PKU. The couple tells the nurse that they are
planning to have a second baby. Because their daughter has PKU, they
are sure that their next baby won't be affected. What response by the
nurse is most accurate?
a. "Good planning; you need to take advantage of the odds in your
favor."
b. "I think you'd better check with your doctor first."
c. "You are both carriers, so each baby has a 25% chance of being
affected."
d. "The ultrasound indicates a boy, and boys are not affected by PKU." -
Correct Answers ✅ANS: C
The chance is one in four that each child produced by this couple will be
affected by PKU disorder. This couple still has an increased likelihood of
having a child with PKU. Having one child already with PKU does not
guarantee that they will not have another. These parents need to
discuss their options with their physician. However, an opportune time
has presented itself for the couple to receive correct teaching about
inherited genetic risks. No correlation exists between gender and
inheritance of the disorder because PKU is an autosomal recessive
disorder.
2. The nurse is providing genetic counseling for an expectant couple
who already have a child with trisomy 18. The nurse should:
