Biology 1002B Lecture Notes - Lecture 18: Inclusive Fitness, Kin Selection, Social Dilemma
9 Apr 2016
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Selection is fundamentally competitive; the struggle to exist. Hiv resistant bodies vs. hiv bodies without the resistance. Both actor and recipient benefit = cooperation. Both actor and recipient harmed = spite. Is parental care altruism: no, they are technically carrying on their genes. Brooklyn man misses job interview to save 9-month-old baby that was blown onto the track of a subway train : ^ altruism! Determines whether altruism (costly) traits favoured rb > c b, benefit received by donor"s relatives r, weighted by degree of relationship c, does this outweigh costs to donor"s direct fitness. 2 partners rob a bank: if both partners cooperate, 2 years in jail, if both defect, 8 years, one cooperates & the other defects; cooperater gets 10 yrs. But payoff for mutual defection is worse than mutual cooperation. Both players would be better off if they could trust each other: solution: repeated interactions between individuals, selection can favour altruism if it"s later reciprocated.
