Biology Inheritance / Variation & Genetics UHS 2022
PMDC Verified Question 65 of 94
Which one of the following is X-linked dominant disorder?
A
Haemophilia
B
Color blindness
C
Hypophosphatemic rickets
D
Hypertrichosis
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Hypophosphatemic rickets
Concept:

An X-linked dominant disorder requires only one defective copy of an X-chromosome gene to cause the disease, regardless of biological sex.

Solution:

  • Hypophosphatemic rickets (also known as Vitamin D-resistant rickets) is a well-known X-linked dominant disorder.
  • Because it is dominant, an affected father will pass the disorder to 100% of his daughters, but none of his sons.


Why other options are incorrect:

  • Haemophilia & Color blindness: These are strictly X-linked recessive.
  • Hypertrichosis: Heavy hair growth on the ear pinna is a holandric trait, meaning it is Y-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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