Biology Inheritance / Variation & Genetics UHS 2023
PMDC Verified Question 44 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 trait requires only one copy of the mutated allele on the X chromosome for the disorder to be expressed.

Solution:

  • Hypophosphatemic rickets (Vitamin D-resistant rickets) is characterized by an X-linked dominant inheritance pattern.
  • Because it is dominant, an affected father (\(X^D Y\)) will pass it to 100% of his daughters, but 0% of his sons. An affected heterozygous mother will pass it to 50% of all her children.


Why other options are incorrect:

  • Haemophilia & Color blindness: These are classic X-linked recessive disorders.
  • Hypertrichosis: A Y-linked trait passed strictly from father to son.

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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