11-07-11 Kin Selection and Cooperation

11-07-11 Kin Selection and Cooperation - ZOL 445 Evolution...

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ZOL 445 Evolution November 7, 2011 Kin Selection and Cooperation Altruism is common in nature: Heroism Alarm call Cooperative breeding Cleaner fish Is altruistic behavior for the benefit of the group? Darwin proposed group selection: o “He who was ready to sacrifice his life, as many a savage has been, rather than betray his comrades, would often leave no offspring to inherit his noble nature.” o “A tribe including many member who…were always ready to give aid to each other and sacrifice themselves for the common good, would be victorious over most other tribes; and this would be natural selection.” Challenge: What happens when a selfish individual finds itself in an altruistic group? o Altruistic groups are subject to “subversion from within” Solutions to the problem of altruism: o Kin selection o Reciprocal altruism o Group selection? So, how does altruism evolve? If an allele for altruism were to arise through mutation, how would that allele spread in a selfish world? What general condition must apply if altruism is to spread?
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This note was uploaded on 12/21/2011 for the course BIO 202 taught by Professor Brooks during the Fall '11 term at UCSB.

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11-07-11 Kin Selection and Cooperation - ZOL 445 Evolution...

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