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This page has been archived and is no longer updated. Whether an animal will become a male, a female, or a hermaphrodite is determined very early in development. Scientists have worked for hundreds of years to understand the sex-determination system. For instance, in B. If the male's heat could overwhelm the female's coldness, then a male child would form.
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Sex Determination

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Genetic Mechanisms of Sex Determination | Learn Science at Scitable

Sex Determination is the process by which two sexes, male and female, become into being. It determines the development of the sexual organs of the organism. The presence or absence of the X chromosome in male gametes determines sex. Females are the homogametic sex XX.
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XX-XO system

NCBI Bookshelf. Although both mammals and fruit flies produce XX females and XY males, their chromosomes achieve these ends using very different means. The sex-determining mechanisms in mammals and in insects such as Drosophila are very different.
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