Nokea
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.
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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.
What complication can result from untreated respiratory distress in the newborn?
- A. Esophageal atresia
- B. Gastric dilation
- C. Cold stress
- D. Reopening of the foramen ovale
Correct Answer: D
Rationale: Respiratory distress can cause increased pressure in the right ventricle, causing reopening of the foramen ovale.
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.
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.
What is the total number of chromosomes contained in a mature sperm or ovum?
- A. 22
- B. 23
- C. 44
- D. 46
Correct Answer: B
Rationale: Gametes (sex cells) contain 23 chromosomes.