Biolo1100 Chapter 8 Evolution and Natural Selection
  1. Charles Darwin published "The Origin of Species" in 1859, based on his observations on a five-year voyage around the world.
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  2. His observations in South America and the Galapagos   Islands led Darwin to hypothesize about the evolution   of species.
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  3. Evolution occurs when the allele   frequencies in a population change.
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  4. Four mechanisms can give rise to evolution  .
     
    • mutation
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    • genetic drift and bottlenecks
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    • migration and gene flow
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    • natural selection

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  5. Over time, populations evolve and become adapted   to their environments.
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  6. Evidence for evolution includes:
     
    • Biogeography
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    • The fossil record
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    • The anatomical   record.
       
      • vestigial   structures
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      • homologous   structures
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      • analogous   structures
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      • comparative embryology  

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    • The molecular   record.

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  7. Evolution is a random process and does not yield perfect   organisms.
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