- May 6, 2013
Yellow is a color where physiological differences can matter. There's a gene called Ser180 that has an allele, Ala180. 40% of Caucasians have it. Men with the Ser180 allele have red cones with a peak sensitivity 4 nm higher than people with Ala180. It doesn't have much effect on how people see red, but quite an effect on yellow. That's because yellow is seen when the red and green cones are equally stimulated.