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XY sex-determination system
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=== Ancient ideas on sex determination === [[Aristotle]] believed incorrectly that the sex of an infant is determined by how much heat a man's sperm had during insemination. He wrote: {{Blockquote|text=... the semen of the male differs from the corresponding secretion of the female in that it contains a principle within itself of such a kind as to set up movements also in the embryo and to concoct thoroughly the ultimate nourishment, whereas the secretion of the female contains material alone. If, then, the male element prevails it draws the female element into itself, but if it is prevailed over it changes into the opposite or is destroyed.}} Aristotle claimed in error that the male principle was the driver behind sex determination,<ref>{{cite book | vauthors = Aristotle | title = De Generatione Animalium | date = September 2013 | trans-title = Generation of Animals | language = Latin | volume = 766B | pages = 15β17 | publisher = General Books | isbn = 978-1-230-42265-7 }}</ref> such that if the male principle was insufficiently expressed during reproduction, the [[fetus]] would develop as a female.
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