BIOL 290 Lecture Notes - Lecture 10: Inclusive Fitness, Reciprocal Altruism, Social Grooming
Document Summary
4:02 pm: darwinian fitness is based on selfishness, helping someone else can reduce one"s own fitness (cost) and improve the other individual"s. Fitness is relative to that of others in a population fitness ( benefits: kin selection. Coefficient of relatedness between parent and offspring is 0. 5; and this makes sense because offspring share 50% of their genes. Inclusive fitness: personal fitness + kinship component: personal fitness: r x number of surviving offspring personally produced by the individual, kinship component: r x number of surviving relatives that the individual helped produce or keep alive. Inclusive fitness: r+kinship component: altruistic behaviors in belding"s ground squirrels, breed in colonies, male offspring disperse far from native burrow. Female offspring tend to remain and breed close by; females in proximity tend to be closely related. Lots of opportunities: conditions that favor evolution of reciprocal altruism, memory.
