Biological Drifts - DIFFERENCE BETWEEN?:

Classical Selection?
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Genetic driftRandom fluctuations in the frequency of the appearance of a gene in a small isolated population, presumably owing to chance rather than natural selection.

Bottlenecks occur when a population's size is reduced for at least one generation and can reduce a population's genetic variation by a lot.

A founder effect occurs when a new colony is started by a few members of the original population

Natural selection is the gradual, non-random process by which biological traits become either more or less common in a population as a function of differential reproduction of their bearers. It is a key mechanism of evolution. The term "natural selection" was popularized by Charles Darwin who intended it to be compared with artificial selection, what we now call selective breeding.

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