How are the alleles frequencies of the two populations different?

Microevolution and population genetics. Microevolution, or evolution on a small scale, is defined as a change in the frequency of gene variants, alleles, in a population over generations. The field of biology that studies allele frequencies in populations and how they change over time is called population genetics.

Explanation:

In natural populations, the mechanisms of evolution do not act in isolation. ... of one of the alleles in a population and thus to the loss of other alleles, such ... Figure 2: Simulations of allele-frequency change in 10 replicate populations (N = 20).

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explanation:

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