Tim_Tyler comments on Moral Error and Moral Disagreement - Less Wrong
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That argument is not right - as fig wasps demonstrate. Organisms can exhibit developmental plasticity, and show different traits under different circumstances. Humans are a good example of this: we show remarkable developmental plasticity due to neoteny. E.g. the phenotypes of the jockey and the sumo wrestler are remarkably different. The jockey is continuously on calorie restriction - and so exhibits a radically different gene expression profile in almost every tissue.