Gene flow is the process by which genes are transferred from one population to another. This can happen when individuals from different populations interbreed, introducing new genetic material into a population. For example, if a bird from one area migrates and mates with a bird from another area, the offspring may inherit traits from both parents, leading to increased genetic diversity. This mixing of genes is important for the health of populations. It can help them adapt to changing environments and resist diseases. Without gene flow, isolated populations may become less diverse and more vulnerable to extinction, as they lack the genetic variation needed to thrive.