Question

difference between natural selection, generic drift and geographical isolation.
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Answer 1

Natural selection is a natural process by which a trait becomes common in a population, as it provides survival advantage.it occurs due to successive variations produced.
Genetic drift is the process by which a trait becomes common in a population,because of external factors.it results in change in gene frequency of remaining population.
Geo. Isolation is a type of speciation, and it leads to reproductive isolation.it occurs due to geographic al barriers like mountain ranges,lakes .