How are genes and proteins similar to homologus structure when determining evolutionary relationships among species?

Homologous traits of organisms are due to sharing a common ancestor, and such traits often have similar embryological origins and development. This is contrasted with analogous traits: similarities between organisms that were not present in the last common ancestor of the taxa being considered but rather evolved separately.

To see a general view of a microscope slide, use low power. to see a more specific and detailed view, use high power.