what is lack of gene flow?

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Solution

Lack of gene flow means that a population splits into two or more individual populations due to which there is no flow of genetic information between the two gene pools. Lack of gene flow results in speciation due to genetic drift and natural selection acting independently on two populations.

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What do you call the movement of a gene (gene flow) from one species into the gene pool of another by the repeated backcrossing?

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