Gene flow is defined as: exchange of genes between populations.
production of new genetic mat vial.
production of new alleles.
chance loss of alleles in a population.

Explanation:

In population genetics, gene flow (also known as gene migration or allele flow) is the transfer of genetic variation from one population to another. If the rate of gene flow is high enough, then two populations are considered to have equivalent allele frequencies and therefore effectively be a single population.

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