A) genetic drift
B) isolation
C) gene pool
D) gene flow
Correct Answer: A
Solution :
Random fluctuation in allele frequencies over time, due to chance occurrence alone is called genetic drift or Sewall Wright effect (named after the American geneticist who realised its evolutionary significance). Gene pool is some total of all genotypes in a given population. Gene flow is the change in allele frequencies due to immigration or emigration.
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