Both parents have normal color vision. where did the, Ask an Expert

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Red-green color blindness is a human x-linked recessive disorder. a young mn with a 47,XXY karyotype (linefelter syndrome) is color blind.
His 46, XY brother is also colorblind. Both parents have normal color vision. Where did the nondisjunction occur that gave rise to the young man with klinefelter syndrome?

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