The more closely related the animals are, the more similar is the code in a shared gene. Learn more about one scientist's search the genes of various animals to find out which one gave rise to all the others.
All animals have a similar set of regulatory genes that direct the formation of the body, whether it’s a worm, frog or human. This video focuses on the Hox genes, which all animals except sponges have.
Shows how species diverge from a common ancestor by analyzing differences in their genomes.