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babar90 t1_jbol7y7 wrote

See https://en.wikipedia.org/wiki/Sex-determining_region_Y_protein and https://en.wikipedia.org/wiki/Y_chromosome#Human_Y_chromosome

Most genes involved in male sexual characters are on other chromosomes but require a cascade initiated by expression of SRY (thus presence of Y chromosome) to be (un)expressed

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smapdiagesix t1_jbqje00 wrote

Sometimes SRY gets copied onto the end of an x chromosome during meiosis. People who inherit this end up as xx males.

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