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Causes and Risk Factors

Color deficiency is usually a hereditary condition. The trait is passed on the X chromosome, and because males only have one X chromosome, it is easier for them to inherit color vision deficiency. A mother who carries one normal X chromosome and one X chromosome with a mutation of red and/or green pigments is not affected, but her son has a 50% chance of having a color vision deficit. Fathers cannot pass it to their sons, because they supply only a Y chromosome to the ...Read the full article