Chapter 06: Genetics, Conception, and
Fetal Development Perry: Maternal Child
Nursing Care, 6th Edition 32 complete
solutions.
Chapter 06: Genetics, Conception, and
Fetal Development Perry: Maternal Child
Nursing Care, 6th Edition 32 complete
solutions.
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." - ANSWER 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:
a. tell the couple they need to have an abortion within 2 to 3 weeks.
b. explain that the fetus has a 50% chance of having the disorder.
c. discuss options with the couple, including amniocentesis to determine whether the fetus is affected.
d. refer the couple to a psychologist for emotional support. - ANSWER ANS: C
Genetic testing, including amniocentesis, would need to be performed to determine whether the fetus is
affected. The couple should be given information about the likelihood of having another baby with this
, Chapter 06: Genetics, Conception, and
Fetal Development Perry: Maternal Child
Nursing Care, 6th Edition 32 complete
solutions.
disorder so that they can make an informed decision. A genetic counselor is the best source for
determining genetic probability ratios. The couple eventually may need emotional support, but the
status of the pregnancy must be determined first.
3. The nurse is assessing the knowledge of new parents with a child born with maple syrup urine disease
(MSUD). This is an autosomal recessive inherited disorder, which means that:
a. both genes of a pair must be abnormal for the disorder to be expressed.
b. only one copy of the abnormal gene is required for the disorder to be expressed.
c. the disorder occurs in males and heterozygous females.
d. the disorder is carried on the X chromosome. - ANSWER ANS: A
MSUD is a type of autosomal recessive inheritance disorder in which both genes of a pair must be
abnormal for the disorder to be expressed. MSUD is not an X-linked dominant or recessive disorder or
an autosomal dominant inheritance disorder.
4. In presenting to obstetric nurses interested in genetics, the genetic nurse identifies the primary risk(s)
associated with genetic testing as:
a. anxiety and altered family relationships.
b. denial of insurance benefits.
c. high false-positive results associated with genetic testing.
d. ethnic and socioeconomic disparity associated with genetic testing. - ANSWER ANS: B
Decisions about genetic testing are shaped by socioeconomic status and the ability to pay for the
testing. Some types of genetic testing are expensive and are not covered by insurance benefits. Anxiety
and altered family relationships, high false-positive results, and ethnic and socioeconomic disparity are
factors that may be difficulties associated with genetic testing, but they are not risks associated with
testing.
5. A man's wife is pregnant for the third time. One child was born with cystic fibrosis, and the other child
is healthy. The man wonders what the chance is that this child will have cystic fibrosis. This type of
testing is known as:
Fetal Development Perry: Maternal Child
Nursing Care, 6th Edition 32 complete
solutions.
Chapter 06: Genetics, Conception, and
Fetal Development Perry: Maternal Child
Nursing Care, 6th Edition 32 complete
solutions.
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." - ANSWER 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:
a. tell the couple they need to have an abortion within 2 to 3 weeks.
b. explain that the fetus has a 50% chance of having the disorder.
c. discuss options with the couple, including amniocentesis to determine whether the fetus is affected.
d. refer the couple to a psychologist for emotional support. - ANSWER ANS: C
Genetic testing, including amniocentesis, would need to be performed to determine whether the fetus is
affected. The couple should be given information about the likelihood of having another baby with this
, Chapter 06: Genetics, Conception, and
Fetal Development Perry: Maternal Child
Nursing Care, 6th Edition 32 complete
solutions.
disorder so that they can make an informed decision. A genetic counselor is the best source for
determining genetic probability ratios. The couple eventually may need emotional support, but the
status of the pregnancy must be determined first.
3. The nurse is assessing the knowledge of new parents with a child born with maple syrup urine disease
(MSUD). This is an autosomal recessive inherited disorder, which means that:
a. both genes of a pair must be abnormal for the disorder to be expressed.
b. only one copy of the abnormal gene is required for the disorder to be expressed.
c. the disorder occurs in males and heterozygous females.
d. the disorder is carried on the X chromosome. - ANSWER ANS: A
MSUD is a type of autosomal recessive inheritance disorder in which both genes of a pair must be
abnormal for the disorder to be expressed. MSUD is not an X-linked dominant or recessive disorder or
an autosomal dominant inheritance disorder.
4. In presenting to obstetric nurses interested in genetics, the genetic nurse identifies the primary risk(s)
associated with genetic testing as:
a. anxiety and altered family relationships.
b. denial of insurance benefits.
c. high false-positive results associated with genetic testing.
d. ethnic and socioeconomic disparity associated with genetic testing. - ANSWER ANS: B
Decisions about genetic testing are shaped by socioeconomic status and the ability to pay for the
testing. Some types of genetic testing are expensive and are not covered by insurance benefits. Anxiety
and altered family relationships, high false-positive results, and ethnic and socioeconomic disparity are
factors that may be difficulties associated with genetic testing, but they are not risks associated with
testing.
5. A man's wife is pregnant for the third time. One child was born with cystic fibrosis, and the other child
is healthy. The man wonders what the chance is that this child will have cystic fibrosis. This type of
testing is known as:
