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The gene machine
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advantage allele altruism altruistic behaviour ancestors animals ants argument average pay-off baby bees behave benefit birds body brain brothers and sisters chance chapter cheats child chromosome cistron complex copies copulate cost crossing-over cuckoo Darwin doves eggs evolution evolutionarily stable strategy evolutionary evolve example expect exploit fact father favour female fights gene pool genetic unit grudgers happen hawk hawks and doves human idea individual individual’s kin selection kind large number less living look male mate means meme meme pool molecules mother natural selection nest offspring paradoxical parental investment particular pattern population possible predators predict primeval soup queen rearing reason reciprocal altruism relatedness replicators reproduction risk rival selfish gene theory sense sex ratio sexual share simple simulation social insects soup species sperms suckers suppose survival machines tend territory things tion Trivers W. D. Hamilton workers Wynne-Edwards young