Diane Dodd showed that a fly’s diet could affect its sex life. She reared one strain of fruit flies on starch and another identical strain on maltose, a type of sugar. After 25 generations, the ‘starch flies’ preferred to mate with other starch flies, while the maltose flies were biased towards their own kind. It was a weird result. By changing the flies’ diet, Dodd had somehow altered their sexual preferences.
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