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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.
Unlike red green color blindness, the chance of having blue color blindness is equal in both men and women as the gene is found on a different chromosome (chromosome 7). This gene is shared equally by men and women and blue color blindness comes from a mutation of this gene.