Biology Inheritance / Variation & Genetics MDCAT 2016
PMDC Verified Question 90 of 94
Which one of the following is X-linked trait?
A
Male pattern baldness
B
Haemophilia
C
Diabetes mellitus
D
Erythroblastosis foetalis
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Haemophilia
Concept:

X-linked traits are governed by genes located specifically on the X chromosome.

Solution:

  • Haemophilia is a well-documented genetic disorder caused by a deficiency in clotting factors, with the responsible gene located on the X chromosome.
  • It follows an X-linked recessive inheritance pattern.


Why other options are incorrect:

  • Male pattern baldness: This is a sex-influenced trait, meaning it is governed by an autosomal gene whose expression is heavily dependent on male hormones (testosterone).
  • Erythroblastosis foetalis: Caused by Rh factor incompatibility, which is determined by an autosomal gene.

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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