Why are men more likely to be colorblind?
Joking aside, why are men far more likely than women to be colorblind? Well, genetically derived colorblindness is a sex-linked trait that is attached to the X chromosome in a human male. The X chromosome determines the creation of photo pigments and, if the gene is damaged, the eye may not fully develop enough to see colors. The fact is, men have only one X chromosome but women have two, which means that the effect may not be canceled out in a human male.
Interesting fact: the U.S. Army did tests, that showed that camouflage that fooled a person without color-blindness stood right out to a person with color-blindness. 🙂