BIOL359 Study Guide - Final Guide: Hadean, Assortative Mating, Phyletic Gradualism

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Direct fitness: an individual"s contribution to the next generation directly through reproduction. Indirect fitness: additional reproduction caused by relatives to the species resulting from actions (assistance). The additional reproduction would not have been made without the assistance. Kin selection: is the selection for and spread of alleles that cause increased indirect fitness. Altruism is paradox to darwin"s theory it is highly unlikely that a species would undergo an action that would in turn decrease its own fitness for the increase of another individuals fitness. However selection would favour traits that decrease an individual"s personal fitness if it increased the survival traits and fitness of close relatives. Co-efficient of relatedness (r) the probability that two homologous alleles are identical by decent; involves an allele in the actor and allele in the recipient at the same locus. Hamiltons rule: the spread of an allele for altruistic behavior will occur if b r c > 0.

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