For example, the human eye uses four genes to make structures that sense light: three for color vision and one for night vision ; all four arose from a single ancestral gene.

For example, the human eye uses four genes to make structures that sense light: three for color vision and one for night vision ; all four arose from a single ancestral gene.

For example, the human eye uses four genes to make structures that sense light: three for color vision and one for night vision ; all four arose from a single ancestral gene.

0.005 seconds.