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  1. Repugnance

    a natural, basic, or habitual repugnance; aversion. Synonyms: hatred, detestation, abhorrence, disgust Antonyms: attraction an instinctive contrariety or opposition in feeling. an object of natural aversion or habitual dislike.
    www.dictionary.com/browse/antipathy
    www.dictionary.com/browse/antipathy
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    In the context of a simple binary-choice model, we show that risk aversion emerges by natural selection if reproductive risk is systematic (i.e., correlated across individuals in a given generation). In contrast, risk neutrality emerges if reproductive risk is idiosyncratic (i.e., uncorrelated across each given generation).
    Their primary debate is about whether or not people’s aversion to homosexuality (colloquially called "homophobia," although both authors acknowledge that this is a misnomer because it is more a negative attitude towards this demographic than it is fear) is a product of natural selection or, alternatively, a culturally constructed, transmitted bias.
    By developing a formal theory of the evolution of preferences in stochastic environments in the context of the simplest possible nontrivial choice problem (a binary choice), we show that the origin of risk aversion is considerably more primitive than previously thought.
    The simplicity of our framework suggests that our results are likely to apply across species and that the degree of risk aversion in animal behavior is significantly influenced by the stochastic properties of the environment as it affects fecundity.
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