Men See Red Differently Than Women

"She sees crimson, burgundy, and tomato. He sees red. Just plain ol' red. Why? It turns out there's a perfectly good reason why men can't see what is so obvious to women: the many variations--some subtle, some bold--of the color red. Reuters reports that researchers from Arizona State University in Tempe have determined there is a gene that allows us to see the color red, and that gene comes in a high number of variations. Because the gene sits on the X chromosome--and women have two X chromosomes and so two copies of this gene, compared with only one for men--the gene aids women's ability to perceive the red-orange color spectrum. The study findings were reported in the American Journal of Human Genetics.
via [x]