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Which of the following is a characteristic feature of X-linked recessive disorders?

A.

Fathers can pass the disorder to their sons.

B.

Carrier females rarely show symptoms.

C.

Equal male and female prevalence.

D.

All daughters of affected males are carriers.

Answer and Explanation

The Correct Answer is D

(A) Fathers can pass the disorder to their sons: Incorrect because fathers pass the Y chromosome to sons, not the X.

(B) Carrier females rarely show symptoms: While carrier females often do not show symptoms due to having one unaffected X chromosome, it is not a defining feature.

(C) Equal male and female prevalence: Incorrect because X-linked recessive disorders affect males more frequently, as they only have one X chromosome.

(D) All daughters of affected males are carriers: Since males have only one X chromosome, they pass their X chromosome to all daughters, making them carriers.


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Related Questions

Correct Answer is C

Explanation

(A) Seizure: Not a typical side effect of ARBs.

(B) Bradycardia: ARBs do not significantly affect heart rate.

(C) Hyperkalemia: Angiotensin II receptor blockers (ARBs), like losartan, reduce aldosterone secretion, leading to potassium retention and hyperkalemia.

(D) Insomnia: Not a common adverse effect of ARBs.

Correct Answer is {"A":{"answers":"A"},"B":{"answers":"A"},"C":{"answers":"A"},"D":{"answers":"B"},"E":{"answers":"B"},"F":{"answers":"B"}}

Explanation

Hyperthyroidism:

  • Heat Intolerance: Increased metabolism leads to excessive heat production.
  • Exophthalmos: Protrusion of the eyes due to autoimmune effects in conditions like Graves’ disease.
  • Tremors: Overstimulation of the nervous system causes fine hand tremors.

Hypothyroidism:

  • Bradycardia: Reduced thyroid hormone slows metabolism and heart rate.
  • Weight Gain: Decreased metabolism leads to fat accumulation.
  • Dry Coarse Skin: Reduced metabolism causes decreased sweat and oil production, leading to dry skin.

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