Biology Evolution PMC 2020
PMDC Verified Question 44 of 47
____ occurs because natural selection gives some alleles a better chance of survival than others.
A
Evolution
B
Fitness
C
Crossing over
D
Artificial selection
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Evolution
Concept:

Natural selection acts on the genetic variation within a population, favoring alleles that confer a survival and reproductive advantage.

Solution:

  • When specific alleles provide a survival advantage, they increase in frequency over generations.
  • This gradual change in the genetic makeup (allele frequencies) of a population over time is the very definition of Evolution.


Why other options are incorrect:

  • Fitness: This is the measure of reproductive success, not the resulting process of change itself.
  • Crossing over: A mechanism during meiosis that creates genetic variation, but it is not caused by natural selection.
  • Artificial selection: This is driven by human preference, not natural environmental pressures.

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