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12.10.07 - Darren Rothberg Biol 105 Evolution 12.10.07 I...

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Darren Rothberg Biol 105 – Evolution 12.10.07 I) Units of Selection 1) Allele , cell, organism , family, social group, species 2) Consider: a Specialist insect vs. generalist b Generalist eats many plants c A specialist in the population eats only the best kind: has highest fitness d What will evolve? e Which type (specialist/generalist) do you think is most likely to persist? 3) How do we explain the existence of altruism? a Ex. (i) Parental care; the ultimate altruistic behavior (ii) Alarm calls of ground squirrels (iii) Worker ants, bees, termites that forgo reproduction Eusocial behavior 4) Some terms: a Direct fitness: Fitness due to replication of one’s own alleles b Indirect fitness: Fitness due to the replication of alleles of close relatives c Inclusive fitness: Combine the two Direct fitness + indirect fitness d Kin selection: Selection for an action (behavior) that lowers an individual’s own probable reproductive success but increases that of relatives e Cooperation (or Mutualism):
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