What is the effect of gene flow on a population's genetic variation?

Gene flow refers to the transfer of genetic material between populations through migration or interbreeding. This process has a significant impact on a population's genetic variation by introducing new alleles and combinations of alleles into the gene pool. When individuals from different populations interbreed, the genetic diversity of the receiving population is enhanced, leading to an increase in genetic variation.

This added variation can be advantageous for the overall adaptability of the population in changing environments, as it may introduce new traits that could help with survival and reproduction. The benefits of increased genetic variation can also include a greater resilience to diseases and environmental pressures. Therefore, the correct answer highlights that gene flow serves as a mechanism for enhancing genetic diversity within populations.