Evolution

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Evolution

• SelectionNatural vs. artificialFitnessGalapagos
  FinchDirectional, Stabilizing, Disruptive
  SelectionPolymorphism several forms of a
  species in same habitat
• Microevolution vs. MacroevolutionMicroevolution
  change in allele frequencyMacroevolution
  formation of new species

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Field Assistants
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Chesapeake Bay Retrievers

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English Peppered Moth Example
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English Peppered Moth Example
Before industrial revolution After industrial
revolution
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Darwins 2 Major Ideas

• Variation within an species
• (organisms of the same species do not look
  exactly alike)
• Not all the offspring produced survive(there is
  a struggle for existence)

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Macroevolution formation of new species

• Allopatric Speciation formation of new species
  due to geographic (physical) barrier
• Sympatric Speciation formation of new species
  due to genetic mutation or reproductive isolation
  (although they occur together)
• Adaptive Radiation formation of new species due
  to new opportunities (niches)i.e. islands