Dictionary of Human Evolution and Biology

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Haplodiploid Hypothesis

Proposal that an individual can increase its fitness and that of close relatives by taking risks that enhance the fitness of close relatives, a net result measured as inclusive fitness. Attributed to W. D. Hamilton as an extension of kin selection, and applied to the Hymenoptera where males are haploid and females are diploid, Hamilton pointed out that a female shares three-quarters of her genes with her mother, and would therefore enhance her own inclusive fitness by helping her mother care for the sisters in her sibship.

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