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Med School for Writers: Color blindness

Med School for Writers: Color blindness

Color blindness—it’s all about the genes, baby. Recently, a writer asked me about color blindness. Color blindness is usually congenital (actually hereditary) and much more common in boys, since it is usually X linked. Women have two X chromosomes and usually only one is defective (a gene that codes for color vision). We all have two genes for each of thousands of traits, one from mom, one from dad. If a man has a defective gene on the X chromosome,…

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