ChatterBank16 mins ago
Colour Blind
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Why are only men afflicted with colour blindness?
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For more on marking an answer as the "Best Answer", please visit our FAQ.Piljim has it backwards - the tendency for colour blindness is caused by the absence of a gene. The normal gene is acrried by the X chromosome, so men only need to inherit one duff gene to be affected. women will get it too, but only if they get two duff genes. A woman with only one faulty gene is a carrier and has a 50% chance of her sons being affected.