Nokea
A patient at the obstetric office has just learned she is pregnant with dizygotic twins. What facts will the nurse include when educating this patient? (Select all that apply.)
- A. Dizygotic twins are the same sex.
- B. Dizygotic twins share a placenta.
- C. Dizygotic pregnancies tend to repeat in families.
- D. Dizygotic twins have separate chorions.
- E. Dizygotic twin incidence decreases with maternal age.
Correct Answer: C,D
Rationale: Dizygotic twins tend to repeat in families and have separate chorions. They can be the same sex or different sexes and have their own placenta. Incidence increases with maternal age.
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A woman who is 25 weeks pregnant asks the nurse what her fetus looks like. What does the nurse explain is one physical characteristic present in a 25-week-old fetus?
- A. Lanugo covering the body
- B. Constant motion
- C. Skin that is pink and smooth
- D. Eyes that are closed
Correct Answer: A
Rationale: By 25 weeks, the body of the fetus is covered with lanugo, the eyes are open, the skin is wrinkled, and the fetus has definite periods of movement and sleeping.
What does the nurse explain can affect the survival of the X- and Y-bearing sperm after intercourse?
- A. Age
- B. Estrogen level
- C. Body temperature
- D. Level of feminine hygiene
Correct Answer: B
Rationale: Estrogen levels and the pH of the female reproductive tract can affect the survival of the X and Y-bearing sperm as well as their motility.
During an ultrasound, two amnions and two placentas are observed. What will be the most likely result of this pregnancy?
- A. Dizygotic twins
- B. Monozygotic twins
- C. Conjoined twins
- D. High-birth weight twins
Correct Answer: A
Rationale: Dizygotic twins always have two amnions and two chorions (placentas).
A couple just learned they are expecting their first child and are curious if they are having a boy or a girl. At what point of development can the couple first expect to see the sex of their child on ultrasound?
- A. 4 weeks' gestational age
- B. 6 weeks' gestational age
- C. 10 weeks' gestational age
- D. 16 weeks' gestational age
Correct Answer: C
Rationale: The fetal period begins at the 9th week, and by the 10th week the external genitalia are visible to ultrasound examination.
A pregnant woman states, 'My husband hopes I will give him a boy because we have three girls.' What will the nurse explain to this woman?
- A. The sex chromosome of the fertilized ovum determines the gender of the child.
- B. When the sperm and ovum are united, there is a 75% chance the child will be a girl.
- C. When the pH of the female reproductive tract is acidic, the child will be a girl.
- D. If a sperm carrying a Y chromosome fertilizes an ovum, then a boy is produced.
Correct Answer: D
Rationale: When a Y-bearing sperm fertilizes an ovum, a male child is produced.