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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.
Color blindness is a sex-linked trait that is caused by a recessive gene. Sex-linked characteristics occur more often in males because they only have one X chromosome while females have two X chromosomes. The X chromosome holds much more genetic information than the Y chromosome. So, while females need to have two recessive genes to become color blind, males only need one recessive gene to be affected. Therefore, males have a greater chance of inheriting color blindness.