Biology Inheritance / Variation & Genetics PMC 2020
PMDC Verified Question 71 of 94
Which traits are most likely to affect men than women?
A
X - linked recessive
B
Autosomal dominant
C
X - linked dominant
D
Autosomal recessive
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: X - linked recessive
Concept:

The asymmetric distribution of sex chromosomes (XX vs XY) drastically impacts how recessive genes are expressed.

Solution:

  • X-linked recessive traits overwhelmingly affect men more than women.
  • A male possesses only one X chromosome (hemizygous). If he inherits just a single recessive mutant allele on his X chromosome, he will express the disorder since there is no dominant allele to mask it.
  • A female has two X chromosomes, meaning she must inherit two copies of the recessive allele to express the disease; otherwise, she remains an asymptomatic carrier.


Why other options are incorrect:

  • X-linked dominant traits actually tend to affect more women, because women have twice the statistical chance of inheriting the single defective X chromosome required for the disease.
  • Autosomal traits generally affect males and females equally.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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