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Gene mutation on the X chromosome is most common and also explains why (depending on nationality) some 7% of males, but less than 1% of females exhibit color blindness of some form. Males only have one X chromosome, whereas females have two.
Sources for This Page. 1  Deeb SS. Molecular genetics of color-vision deficiencies. 2  Deeb SS. The molecular basis of variation in human color vision. 3  Gardner JC, Michaelides M, Holder GE, Kanuga N, Webb TR, Mollon JD, Moore AT, Hardcastle AJ. Blue cone monochromacy: causative mutations and associated phenotypes. Mol Vis.