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We take it for granted that we maintain the sex we are born with, including whether we have testes or ovaries. Aristotle believed that the sex of an infant is determined by how much heat a man's sperm had during insemination. Some other insects have the X0 sex-determination system , where just one chromosome type appears in pairs for the female but alone in the males, while all other chromosomes appear in pairs in both sexes. Hormone levels in the male parent affect the sex ratio of sperm in humans. Variations to the sex gene karyotype could include rare disorders such as XX males often due to translocation of the SRY gene to the X chromosome or XY gonadal dysgenesis in people who are externally female due to mutations in the SRY gene. Platypus , a monotreme , use five pairs of different XY chromosomes with six groups of male-linked genes, AMH being the master switch. In these cases, the SOX9 gene, involved in the development of testes, can induce their development without the aid of SRY. List of related male and female reproductive organs Prenatal development Embryogenesis. Hermaphrodite Intersex Disorders of sex development Sex reversal.

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