Biology Inheritance / Variation & Genetics NUMS 2023
PMDC Verified Question 45 of 94
Which of the following traits is transmitted directly from affected father to only his son?
A
Autosomal
B
X-linked
C
Y-linked
D
X-Y linked
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Y-linked
Concept:

The Y chromosome is unique because it is present only in biological males and determines male sex characteristics.

Solution:

  • Males possess an XY chromosome pair, while females possess XX.
  • A father passes his X chromosome to all his daughters and his Y chromosome to all his sons.
  • Therefore, any gene or trait located exclusively on the Y chromosome (a Y-linked or holandric trait) is transmitted directly from an affected father to only his sons, and to 100% of them.


Why other options are incorrect:

  • Autosomal: Passed to both sons and daughters equally.
  • X-linked: An affected father passes an X-linked trait to his daughters, never to his sons.

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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