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Sex differences in human physiology are distinctions of physiological characteristics associated with either male or female humans. These can be of several types, including direct and indirect. Direct being the direct result of differences prescribed by the Y-chromosome, and indirect being a characteristic influenced indirectly e. Sexual dimorphism is a term for the phenotypic difference between males and females of the same species. Direct sex differences follow a bimodal distribution. Through the process of meiosis and fertilization with rare exceptions , each individual is created with zero or one Y-chromosome. The complementary result for the X-chromosome follows, either a double or a single X.

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