Why is genetic variation within a population essential for evolution?

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asked Jul 14, 2019 149k views

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Ethan Fang · Answer 1 · 2019-07-21T09:17:10+0000

Genetic variation is essential for natural selection because natural selection can only increase or decrease frequency of alleles that already exist in the population. Genetic variation is caused by: mutation. random mating between organisms.

Why is genetic variation within a population essential for evolution?

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