Nokea
The nurse is presenting a conference on gene dominance. What does the nurse report as the percentage of children carrying the dominant gene if one parent has a dominant gene and the other parent does not?
- A. 10%
- B. 25%
- C. 50%
- D. 100%
Correct Answer: C
Rationale: If one parent has a dominant trait and the other does not, then 50% of the children will inherit the trait.
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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).
Where is the usual location for implantation of the zygote?
- A. Upper section of the posterior uterine wall
- B. Lower portion of the uterus near the cervical os
- C. Inner third of the fallopian tube near the uterus
- D. Lateral aspect of the uterine wall
Correct Answer: A
Rationale: The zygote usually implants in the upper section of the posterior uterine wall.
At what point in prenatal development do the lungs begin to produce surfactant?
- A. 17 weeks
- B. 20 weeks
- C. 25 weeks
- D. 30 weeks
Correct Answer: C
Rationale: During week 25, the alveoli begin to produce surfactant, which enables the alveoli to stay open for adequate lung oxygenation to occur.
What organ does the ductus venosus shunt blood away from in fetal circulation?
- A. Liver
- B. Heart
- C. Lungs
- D. Kidneys
Correct Answer: A
Rationale: Fetal blood bypasses the liver through the ductus venosus by carrying blood directly to the inferior vena cava.
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.