Single Gene Gives Mice Three-Colour Vision

A study in the peer-reviewed journal Science shows that mice transgenetically altered with a single human gene are then able to see in full tri-colour vision. Mice without this alteration are normally colour-blind. The scientists speculate that mammalian brains even from animals that have never evolved colour vision are flexible enough to interpret new colour-sense information with just the simple addition of new photoreceptors. Such a result is also indicated by a dominant X chromosome mutation that allows for quad-colour vision in some women