ANT 1 Lecture Notes - Lecture 9: Phenotype, Ostracism, The Selfish Gene
Document Summary
Altruism: acts that are costly to self, beneficial to others. Ex: grooming, coalitions, food sharing, alarm calling. Natural selection normally favors individuals behaving in ways that. Traits unlikely to evolve for good of group. For the good of the group or because there are limited resources. Groups of all cooperators do better than groups of all defectors. Ex: vervet monkeys make alarm calls when they see predator. + rs of listeners, - rs of caller. Given rules of meiosis, we expect half of recipients will carry the same mutant gene as caller. Now altruists are more likely to receive the benefits of altruism. If callers can direct help at hose more likely to have calling allele . When mutations arise in a family group . 1 (calling): average rs in family high. 2 (non calling): average rs in family low. Kin selection explains how the benefits of altruism can be directed at other altruists.
