Evolution9 - Evolution #14: Sociobiology & Evolution in...

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The concept of inclusive fitness can account for most altruistic social behavior most social behaviors are selfish = benefit individ at expense of others, esp competitors even in non-agonistic species, adaptations that benefit one individ will indirectly harm others (superior foraging ability) behavior that maximizes an individual’s survival & reproductive success is favored by selection, regardless of how much damage such behavior does to another individ, local pop, or even entire species so how do we explain apparent “unselfish” behavior? altruism = selflessness = behavior that reduces individs fitness but inc fitness of other individs in the pop o ex) Belding’s ground squirrel cries out to warn unaware individs of predator, but risks revealing its own location o ex) sterile worker bees labor on behalf of 1 fertile queen , sting intruders which kills themselves but defends hive o ex) naked mole rat colony has 1 queen & mates w/ 1-3 kings; rest are nonreproductive females & males who forage & care for royal family, even sacrificing lives by protecting the family from inclusive fitness = total effect the individ has on proliferating its genes by producing its own offspring & by providing aid that enables other close relatives, who share many of those genes, to produce offspring o altruistic behavior may be selected for when it applies to parents sacrificing for offspring
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Evolution9 - Evolution #14: Sociobiology & Evolution in...

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