“No practical biologist interested in sexual reproduction would be led to work out the detailed consequences experienced by organisms having three or more sexes; yet what else should he do if he wishes to understand why the sexes are, in fact, always two?”

— Ronald Fisher, book The Genetical Theory of Natural Selection

Preface, p. ix.
The Genetical Theory of Natural Selection (1930)

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Ronald Fisher28

English statistician, evolutionary biologist, geneticist, a… 1890–1962

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“No practical biologist interested in sexual reproduction would be led to work out the detailed consequences experienced by organisms having three or more sexes; yet what else should he do if he wishes to understand why the sexes are, in fact, always two?”

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