Biology Evolution ETEA 2023 Retake
PMDC Verified Question 21 of 47
According to Neo-Darwinism, which of the following is a cause of evolution?
A
Reproductive isolation
B
Infinite large population
C
Environmental stability
D
Both A and B
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Reproductive isolation
Concept:

Neo-Darwinism (the Modern Synthesis) combines Darwinian natural selection with Mendelian genetics and modern population dynamics to explain speciation.

Solution:

  • Reproductive isolation is a primary driver of macroevolution and speciation.
  • When populations are prevented from interbreeding (due to geographic, temporal, or behavioral barriers), their gene pools diverge over time due to differing selective pressures and genetic drift, ultimately forming new species.


Why other options are incorrect:

  • Infinite large population: According to the Hardy-Weinberg principle, an infinitely large population actually prevents evolution (genetic drift is minimized, maintaining equilibrium).
  • Environmental stability: Stable environments limit evolutionary change, whereas changing environments force adaptation.

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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