Biology Inheritance / Variation & Genetics NUMS 2024
PMDC Verified Question 11 of 94
Which of the following option is correct for the pattern baldness?
A
It is sex linked trait
B
Occurs due to hormonal difference between sexes
C
Heterozygous male is patient
D
Heterozygous female is normal
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Occurs due to hormonal difference between sexes
Concept:

Pattern baldness is a classic example of a sex-influenced trait, not a sex-linked trait.

Solution:

  • Pattern baldness is determined by an autosomal gene, not an X or Y chromosome gene.
  • Its expression is heavily influenced by the presence of high levels of testosterone.
  • Because of this hormonal difference between sexes, the baldness allele acts dominantly in males (requiring only one copy to cause baldness) but recessively in females (requiring two copies).


Why other options are incorrect:

  • Note: While C and D are technically true outcomes of the disease mechanics, Option B describes the fundamental biological reason why the trait behaves the way it does, making it the most comprehensive correct answer per the official key.
  • Sex linked: It is autosomal, not sex-linked.

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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