When an organism joins a new population, its genes become part of the new population’s gene pool. How does this gene flow affect populations? Gene flow between populations has no effect on the gene pool.

Gene flow between populations increases genetic diversity over time.

Gene flow between populations decreases genetic diversity over time.

Gene flow increases the chance for reproductive isolation which can cause new species to form.

A high level of gene flow into a population increases genetic diversity in a population. A high level of gene flow out of a population decreases genetic diversity in a population. Genetic drift is the change in allele frequencies due to "sampling error" factors. Typically, genetic drift has the biggest impact on small populations.

Gene flow (or gene migration) is a mechanism of evolution (change the allele frequencies) which transfers genetic variation among populations due to migration. High level of gene flow decreases the genetic differentiation between the two populations.

Genetic drift is a mechanism of evolution that acts by chance (“sampling error”) often when a population is reduced in size by a natural disaster (bottleneck effect) or when a small group leaves the main population and forms a colony (founder effect).

B . Gene flow between populations increases genetic diversity over time.

Explanation:

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