Gene flow is the exchange of genes between two separate populations. This is most often accomplished when animals or spores from plants migrate to a new area. Any time a gene is introduced into a population where that gene once did not exist, gene flow has occurred.
Here are some examples of gene flow in the plant and animal kingdoms.
Gene flow can shape and change ecosystems and species, which makes it very important to understand both for those who are interested in nature and for those who are interested in science.