BIOL 4471 Lecture Notes - Lecture 8: Eusociality, Natural Selection, Allele
Document Summary
Social behavior within species: action that affects fitness of both actor undertaking behavior and recipient of behavior, strongly affected by kinship. Types of social interactions: actor + recipient benefits cooperative, actor is harmed + recipient benefits altruistic, actor benefits + recipient is harmed selfish, actor + recipient is harmed spiteful. Altruism: relatedness relative measure of genetic similarity defined as proportion of genes shared because of identity by descent. Indirect and direct selection: natural selection differential survival or reproductive success of individuals based on heritable traits, direct selection natural selection that operates on focal individual because trait in question affects fitness of that focal individual. Inclusive fitness: effects of individuals on gene propagation, directly in bodies of offspring that owe existence to parents action, not to efforts of others.
