Final answer:
Gene flow plays a role in speciation by influencing genetic diversity and potentially leading to the formation of new species.
Step-by-step explanation:
Gene flow plays a significant role in speciation by influencing the genetic diversity of populations. Gene flow occurs when genetic material is exchanged between populations or geographic regions, leading to the introduction of new genes. This can result in gradual or abrupt differences in phenotype, and in some cases, can lead to speciation. For example, if gene flow is restricted between populations, it can lead to the accumulation of genetic differences over time, eventually resulting in the formation of new species.