Final answer:
Gene flow is the movement of alleles between populations through the migration of individuals or gametes, contributing to biodiversity and changes in the gene pool.
Step-by-step explanation:
One of the important ways that genetic material is moved between different populations such as through gene flow is the transfer of alleles in and out of a population. This can happen through the migration of individuals or gametes, like pollen or seeds in plants, or the movement of animals from one population to another. For example, plants spread their pollen wide via wind or birds, and animals like lions experience immigration and emigration as members leave and join new prides. This flow of individuals and genetic material is critical in introducing new genetic variations to populations across different geographic locations and habitats, directly impacting the gene pool and contributing to biodiversity.