The significance of genetic variation within populations is fundamental for the adaptive potential of a species. Variation results from mutations, gene flow, and sexual reproduction, providing a pool of traits that can be selected for or against in changing environments. Populations with greater genetic diversity are more resilient to diseases, environmental changes, and other challenges. This variation is crucial for evolution, as it increases the chances of favorable traits emerging, facilitating the process of natural selection and ensuring the long-term survival of species.