The parents of a child with sickle cell anemia do not have the disease and are inquiring about the risk of sickle cell disease in future offspring. The nurse practitioner should explain that with each future pregnancy, there is a:
25% chance of the child having the sickle cell trait.
25% chance of the child having sickle cell anemia.
50% chance of the child not having sickle cell disease or the trait for the disease.
50% chance of the child having sickle cell anemia.
The Correct Answer is B
Rationale:
A. A 25% chance of having the sickle cell trait occurs when both parents are carriers (heterozygous), not when they are unaffected.
B. If both parents are carriers (sickle cell trait, AS), each pregnancy carries a 25% chance that the child will inherit sickle cell disease (homozygous SS).
C. Each child also has a 25% chance of inheriting two normal alleles (AA) and being unaffected, but this does not equal 50%.
D. A 50% chance of having sickle cell anemia is incorrect; the risk is 25% per pregnancy for two carrier parents.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Rationale:
A. Klinefelter syndrome affects males and is characterized by tall stature, small testes, and hypogonadism, not delayed female puberty.
B. Turner syndrome affects females and is associated with short stature (often below the third percentile), gonadal dysgenesis, and delayed or absent puberty. It is a common cause of primary amenorrhea in adolescent girls.
C. Anorexia can cause delayed puberty due to low body weight, but the hallmark of Turner syndrome is short stature from birth.
D. Obesity is more commonly associated with earlier puberty rather than delayed puberty in females.
Correct Answer is A
Explanation
Rationale:
A. In a healthy 10-year-old, a heart rate of 60 beats per minute at rest is concerning because the normal resting heart rate for this age group ranges from approximately 70–120 bpm. A heart rate below 70 bpm (bradycardia) may indicate an underlying cardiac conduction issue or other pathology, particularly if symptomatic.
B. 73 bpm is within the normal range for a 10-year-old at rest.
C. 100 bpm is normal and can be expected depending on activity, anxiety, or mild stress.
D. 120 bpm is at the upper limit of normal for a 10-year-old and may be appropriate depending on recent activity or emotional state.
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