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Question

Genetic drift operates in
  1. Slow reproduction population
  2. Small isolated population
  3. Non-reproduction population
  4. Large isolated population

A
Large isolated population
B
Slow reproduction population
C
Non-reproduction population
D
Small isolated population
Solution
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The correct option is C Small isolated population
Genetic drift is a change in gene frequency in successive generation of a small population due to chance alone rather than natural selection or gene transfer. The effect of genetic drift on a small population is large as compared to that in the larger population which, owing to its large size and a large number of gametes produced, has a greater probability to accurately represent the allelic frequency of a parental population. An isolated population rules out the possibility of gene flow.
Therefore, the correct answer is option C.

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