Page "Microevolution" Paragraph 22
from
Wikipedia
Migration into or out of a population can change allele frequencies, as well as introducing genetic variation into a population.
As barriers to reproduction between two diverging populations are required for the populations to become new species, gene flow may slow this process by spreading genetic differences between the populations.
Gene flow is hindered by mountain ranges, oceans and deserts or even man-made structures such as the Great Wall of China, which has hindered the flow of plant genes.
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