PSYCH 1XX3 Study Guide - Final Guide: Eusociality, Hymenoptera, Kin Recognition
18 Apr 2017
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Psych 1xx3 exam review notes (evolution ii) Altruism exists throughout the animal kingdom, yet natural selection favours the. Problems of altruism: altruists decrease their own fitness when helping others, altruism cannot thrive if it cannot be passed on genetically. + for both actor and recipient: altruism: + for recipient, for actor: selfish: For recipient, + for actor: spite: Adaptations must increase success of the gene not necessarily the group. Fitness from the reproduction of close genetic relatives. Inclusive fitness: direct fitness and indirect fitness combined. Probability that actor and recipient share the gene in question (depends on how genes were inherited). Relatedness to parents and full-siblings is 50% Relatedness to grandparents, aunts, and uncles is 25% Eusocial hymenoptera case where most individuals spend their lives serving the colony without reproducing: has to do with relatedness colonies are often very closely interrelated, ex. Argentine ants: as the proportion of shared alleles increases, aggression decreases, and vice versa.
