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Evolution

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Darwin/Wallace. Charles Darwin and Alfred Russell Wallace proposed and alternative ... According to Darwin what is the smallest unit of evolution? Population ... – PowerPoint PPT presentation

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Title: Evolution


1
Evolution
  • What is evolution?
  • Organisms change over time. Some species will
    become extinct while new species will evolve
  • Descent with modification

2
Evidence for Evolution
  • Fossil record
  • Comparative Anatomy
  • Homologous vs. analogous structures
  • Vestigial Structures
  • Comparative Embryology
  • Molecular Biology
  • Biogeography

3
Lamarck
  • Jean Baptiste Lamarck proposed a mechanism of
    evolution
  • Law of Use and Disuse
  • Law on Inheritance of Acquired Characteristics

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5
Darwin/Wallace
  • Charles Darwin and Alfred Russell Wallace
    proposed and alternative mechanism for
    evolution
  • Natural Selection
  • Observations
  • Organisms over reproduce
  • Resources are limited
  • Variations exist within a population
  • Proposed
  • Variations are heritable
  • Inferred
  • Only the most fit individuals survive and
    reproduce

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  • According to Lamarck what is the smallest unit of
    evolution?
  • Individual
  • According to Darwin what is the smallest unit of
    evolution?
  • Population

8
Evidence for Natural Selection
  • Artificial selection
  • Peppered Moths
  • Antibiotic Resistance in Bacteria
  • How do mutation and recombination contribute to
    natural selection?

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The fins and tail structures seen here are
analogous not homologous structures!
15
In what way are these organisms displaying
examples of convergent evolution?
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Eye sockets in blind salamanders
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Why are there polar bears in the Arctic and
penguins in Antarctica?
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