Science glossary film: Evolution

The gradual change in living forms over successive generations, due to changes in inherited characteristics. In this way all the diversity of life on Earth has developed over millions of years from a common ancestor. At a genetic level, evolution involves certain gene types becoming more common than others, and so is defined as a change in gene frequency of a population over time.

In this way all the diversity of life on Earth has developed over millions of years from a common ancestor. At a genetic level, evolution involves certain gene types becoming more common than others, and so is defined as a change in gene frequency of a population over time.