These pages are part of a site called Evolution that accompany a textbook by the same name. Mark Ridley is the author. In this section: the universal genetic code provides evidence that life has a common ancestor.

These pages are from the Understanding Evolution website for teachers. They focus on homologous structures that organisms with common ancestors share.

Identify the differences in genetic and non-genetic classification methods. Why is genetic evidence powerful for understanding evolutionary relationships among organisms? Find out!