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Sex differences in humans have been studied in a variety of fields. In humans, biological sex is determined by five factors present at birth: the presence or absence of the SRY gene an intronless sex-determining gene on the Y chromosome , the type of gonads , the sex hormones , the internal reproductive anatomy such as the uterus , and the external genitalia. Phenotypic sex refers to an individual's sex as determined by their internal and external genitalia, expression of secondary sex characteristics, and behavior. The sex of the individual can be defined in different ways, giving rise to different conceptual frameworks about what determines sex. A subset of such differences is hypothesized to be the product of the evolutionary process of sexual selection.
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Sex differences in humans

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