LIFESCI 3C03 Lecture Notes - Lecture 18: Public Goods Game, Life Time Fitness, Reciprocal Altruism
3 Apr 2017
School
Department
Course
Professor
Document Summary
Social evolutionists use evolutionary to help understand how individuals behave (both human and animals) Recipient: receives consequences of the action, increasing or decreasing fitness. Mutual beneficial: increase fitness for both individuals. It is an investment because the actor will be paid back. Altruism: actor hurts its fitness to help recipient, lifetime fitness cost to actor to give recipient a lifetime fitness increase. Lemmings do not run off cliffs to kill themselves when the population gets too big. If actor and recipient share the same genotype, it"s like trading actor reproduction for recipient reproduction. It is a currency exchange for identical genes. Spite (stupid): actor hurts self to hurt the recipient. Hamilton"s rule: rb c > 0 for a social action to evolve c: cost to actor. Positive: cost to actor b: benefit for recipient. Positive: benefit r: relatedness, probability that the actor and recipient share the same gene identical by descent from a common ancestor.
