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Why is the frequency of red-green colour blindness is many times higher in males than that in the females?

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The genes with photo-pigments are located on X-chromosome, and if the gene is destroyed or missing, it results in colour blindness. Chances of this disease are much higher in males than in females because males have only one X-chromosome; hence there is no second X-chromosome to compensate for the defect, like in females. Females have colour blindness if the defect is in both her X-chromosomes.

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