A pregnant woman tells the nurse that her father has Huntington's chorea.
The woman and her husband do not have or carry the gene for the disease.
They want to know if their child will have the disease.
What is the correct response by the nurse?
Only boys get dominant diseases, and since you are having a girl, she will be unaffected.
Your child has a 50% chance of being affected.
Your child will not have the disease.
Your child may be affected if you and your husband are carriers.
The Correct Answer is C
Choice A rationale
Dominant genetic diseases are not limited by sex; both males and females have an equal chance of inheriting and expressing the disease if they receive the dominant allele. Therefore, stating that only boys get dominant diseases is scientifically incorrect and does not reflect the principles of Mendelian inheritance for dominant traits.
Choice B rationale
Huntington's chorea is an autosomal dominant disorder. For a child to inherit an autosomal dominant disorder, at least one parent must have the affected gene. Since neither the woman nor her husband have or carry the gene for Huntington's chorea, their child cannot inherit the disease. This negates any 50% chance.
Choice C rationale
Huntington's chorea is an autosomal dominant disorder, meaning only one copy of the affected gene is needed for the disease to manifest. Since the pregnant woman and her husband do not have or carry the gene for Huntington's chorea, there is no possibility for them to pass the gene on to their child. The child will therefore not inherit the disease.
Choice D rationale
For an autosomal dominant disorder like Huntington's chorea, if a person does not have the gene, they cannot be a carrier in the traditional sense of recessive disorders. Carrying implies having a recessive gene without expressing it. Since the parents do not have the gene, the child cannot be affected through parental inheritance.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["8"]
Explanation
1,000 mL ÷ 125 mL/hr = 8 hours.
Correct Answer is B
Explanation
Choice A rationale
While fertility awareness methods require diligent adherence and can have higher failure rates with inconsistent use, stating they are "not very effective" and that pregnancy is "very likely" is a generalization that underestimates their potential effectiveness when used correctly and with high motivation.
Choice B rationale
Fertility awareness methods, such as basal body temperature, cervical mucus, and calendar methods, require significant commitment, self-awareness of bodily signs, and consistent daily record-keeping. When practiced accurately and with dedication, they can be effective for many couples desiring to avoid pregnancy without hormonal or barrier methods.
Choice C rationale
Fertility awareness methods rely on predictable physiological signs. Women with irregular cycles will find it significantly more challenging to accurately identify their fertile window using these methods, as the timing of ovulation and other markers becomes unpredictable, making these methods less reliable for them.
Choice D rationale
While combined oral contraceptives offer high effectiveness and convenience for many, directly advising "you would be much safer taking the pill" dismisses the couple's interest in non-hormonal methods. It also overlooks potential contraindications or personal preferences against hormonal contraception, and does not address their initial question about FAMs directly.
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