5-Cooperation 2010

5-Cooperation 2010 - 1/24/2010 Darwins Problem Evolution by...

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1/24/2010 1 Darwin’s Problem Evolution by Natural Selection requires –reproduction –heritability of traits –variation in success • Traits that increase reproductive success get passed onto the next generation. Traits that aren’t passed on are lost. • Altruism reduces the reproductive success of the individual that exhibits it. • The extreme are eusocial insect workers which are completely sterile •What gives?!? What is Eusociality? Advanced form of social organization (3 criteria): Termites: nest, soldiers and workers Why do we care about eusocial species ? • Eusociality represents an important problem in evolution. (Who gave the orders?) How can altruism evolve? Eusociality represents the pinnacle of altruism. Altruism occurs when an individual acts to help another to the detriment of itself. In biology help and harm are measured in terms of reproductive success. Social insect workers are sterile and have sacrificed all their reproductive success WD Hamilton GC Williams The Resolution (Hamilton, 1964)
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1/24/2010 2 Hamilton’s solution
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5-Cooperation 2010 - 1/24/2010 Darwins Problem Evolution by...

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