Genetic Variation - GCSE Biology Definition

Genetic variation refers to the differences in DNA among individuals within a species. These variations are what make each individual unique, affecting traits like eye colour, height, and even the ability to resist certain diseases. Genetic variation comes from mutations, which are changes in the DNA sequence, as well as the random mixing of genes during reproduction. This variation is important because it helps populations adapt to changing environments and contributes to the process of evolution. In simpler terms, genetic variation is nature's way of making sure that not all individuals are exactly the same, helping species survive and thrive over time.