BISC 102 Chapter Notes - Chapter 51.6,35.6: Eusociality, Allele Frequency, Sexual Selection
6 Apr 2016
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Section 51. 6 - when should i cooperate? (pg. William d. hamilton creates a mathematical model to assess how an allele that contributes to altruistic behaviour could increase in frequency in a population. Formula: br > c r = coefficient of relatedness. Measure how closely actor and beneficiary are related. C = fitness cost of altruistic act to the actor. B = fitness benefit to the recipient. *both c and b are measured units of offspring produced* Altruistic behaviour is most likely when 3 conditions are met: the fitness benefits of altruistic behaviour are high for recipient, altruist and recipient are close relatives, fitness costs to the altruist are low. When hamilton"s rule holds, alleles associated with altruistic behaviour will be favoured by natural selection - because close relatives are very likely to have copies of altruistic alleles. Eusocial animals display extreme forms of altruistic behaviour and kin selection, since only a few individuals reproduce.
