Biology Inheritance / Variation & Genetics SZABMU 2023
PMDC Verified Question 25 of 94
The frequency of a mutant gene in a population would be likely to be increased if:
A
The gene was selectively advantageous
B
The gene were dominant
C
The gene were sex linked
D
The population increases
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: The gene was selectively advantageous
Concept:

Natural selection acts on phenotypic variations, altering allele frequencies over generations based on environmental fitness.

Solution:

  • A mutant gene will rapidly increase in frequency within a population if it is selectively advantageous.
  • This means the mutation provides a survival or reproductive benefit, granting the carriers a better chance to survive, mate, and pass the beneficial allele to the next generation.


Why other options are incorrect:

  • Dominant / Sex-linked: Dominance alone does not dictate frequency. A dominant allele will eventually disappear if it is lethal or highly disadvantageous.
  • Population increase: A larger population does not inherently increase the frequency of a mutant gene unless selective pressures favor it.

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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