How does migration affect evolution? A. Only individuals that leave a population can evolve. B. The allele frequency of a population changes when individuals come into or leave it. C. It lowers the fitness of the individuals that stay in the population. D. When individuals come into a population, they only mate amongst themselves.

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A:

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Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.