What changes in the gene pool allow us to conclude about the evolutionary changes taking place in the population?

Evolutionary changes occurring in the population can be judged by the change in the frequency of occurrence of individual genes. The changes in the external structure of organisms, the characteristics of their behavior and lifestyle, and ultimately, according to the best adaptability of the population to these environmental conditions, are a consequence of an increase in the frequencies of some genes in the gene pool and a decrease in the frequencies of others.

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