Which mechanism maintains genetic variation in a population through mixed gene pools?

Gene flow is the mechanism that maintains genetic variation in a population through the exchange of genes between different populations. This occurs when individuals from one population migrate and interbreed with individuals from another population, resulting in the transfer of alleles. This mixing of gene pools can introduce new genetic material into a population, helping to maintain or increase genetic diversity.

The movement of alleles through gene flow can lead to greater adaptability to changing environments as it may introduce traits that are beneficial for survival. This continuous genetic exchange helps prevent populations from becoming genetically isolated, which can occur in situations such as genetic drift or the founder effect, where smaller or isolated populations may lose genetic diversity over time.

In summary, gene flow promotes genetic diversity by allowing for the mixing of genetic material among different populations, ultimately helping populations adapt and evolve.