Since the discovery of the structure of DNA, a molecular revolution has taken place. Intense investigation by molecular biologists has uncovered new genetic links between very diverse animal species, providing new evidence of common ancestry.
For a summary of key information on molecular evidence, see "New Evidence from Molecular Biology" at the National Academy of Sciences Web site.
To learn how molecular evidence can be compared with anatomical evidence to describe relationships between organisms, do the In-depth Investigation: Molecular Connections activity from Unit 3 of the Evolution Teacher's Guide. Unit 3 pdf file | Resources for this activity