Biology Evolution SZABMU 2024 Reconduct
PMDC Verified Question 12 of 47
The reduction of population size with some specific allele and genotype due to natural disaster is called:
A
Mutation
B
Founder effect
C
Bottle neck effect
D
Speciation
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Bottle neck effect
Concept:

Genetic drift can drastically alter allele frequencies when populations undergo rapid, unselective downsizing.

Solution:

  • When a sudden environmental catastrophe (like a flood, fire, or earthquake) indiscriminately wipes out a large portion of a population, the surviving individuals may not genetically represent the original population.
  • This severe, random reduction in population size and genetic diversity is called the Bottleneck effect.


Why other options are incorrect:

  • Founder effect: Occurs when a few individuals willingly migrate and establish a new isolated colony, not due to a disaster killing the majority.
  • Mutation: The creation of a new allele, not the destruction of a population.

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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