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Basic Group Selection Behaviors of members of a group favor the group’s survival and reproduction at the expense of the individual’s Altruism
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Kin Selection or Inclusive Fitness The evolutionary mechanism that selects for those behaviors that increase the inclusive fitness of the donor. The situation where the individual that benefits from an “altruistic” act is a relative of the donor
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Hamilton’s Kin Selection (or inclusive fitness) Theory When does altruism benefit the giver? Coefficient of relatedness (r): the proportion of genes that two individuals share as a result of common descent Offspring and parent: r = 0.5 Grandoffspring and grandparent: r = 0.25 Cousin: r = 0.125 W. D. Hamilton
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Hamilton’s Kin Selection Theory Hamilton’s rule : altruism pays off if: rb > c r: coefficient of relatedness b: the benefit to the recipient c: the cost of the act Measured in terms of offspring produced
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Adaptation As a “STATE”:
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lecture3 for website - Basic Group Selection Behaviors of...

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