Chapter 12

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  1. Major Transitions (defn)
    fundamental changes in the evolution of life
  2. Major Transitions (list)
    • self-replication and heredity
    • RNA to DNA and proteins
    • origin of first (eukaryotic) cells
    • sexual reproduction
    • multicellularity from unicellular ancestors
    • developmental complexity in multicellularity
    • individuality (gametes)
    • groups/complex societies
    • eusocial societies, division of labor
  3. Features of major transitions
    • Individuals (“pretransition individuals”) give up the ability to reproduce independently, and they join together to form a larger grouping (“posttransition individual”) that shares reproduction
    • Once individuals aggregate into higher-level groupings, they can take advantage of economies of scale and efficiencies of specialization
    • Aggregation and specialization facilitate changes in information technologies. Organisms develop new and increasingly efficient ways to acquire, process, transmit, and store information
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84936
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Chapter 12
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Major Transitions
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