Migration makes it possible for subpopulations to transfer genetic variation, which helps to maintain genetic diversity within each subpopulation.
genetic diversity?will alter gene frequencies by introducing additional copies of an allele already present in the population or by introducing a brand-new allele that has developed as a result of mutation. Migration is necessary for the propagation of that allele over the whole population of that species because mutations do not occur in every group.
Immigration is the introduction of new people to a population. Genetic diversity is boosted. The movement of people away from a population is known as emigration. Genetic diversity is diminished.
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