Darwin’s Voyage
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Darwin’s Voyage

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Darwin’s Voyage Darwin’s Voyage Presentation Transcript

  • Darwin’s Voyage (Set up for Cornell Notes)
  • Darwin’s Observations
    • Charles Darwin was an English naturalist who developed the “Theory of Evolution by Natural Selection.”
    • Darwin went on the HMS Beagle around the world in the 1830’s and observed animals.
    • Species: group of similar organisms that can produce fertile offspring.
  • Similarities and Differences
    • Darwin observed how many organisms are similar yet have important differences.
    View slide
  • Adaptations
    • An adaptation is a trait that helps an organism survive and reproduce.
    View slide
  • Evolution
    • Evolution is the gradual change in a species over time.
    • Scientific Theory: well tested idea that explains a wide range of observations.
    • People use selective breeding to obtain desired traits in crops and animals.
  • Natural Selection
    • Natural selection is the process where individuals that are better adapted are more likely to survive and reproduce, than members of the same species.
    • Overproduction: making more offspring than can possibly survive.
    • Competition: competing for limited resources.
    • Variation: differences between members of the same species
    • Over a long period of time, natural selection can lead to a gradual accumulation of + traits and the disappearance of – traits.
  •  
  • The Role of Genes in Evolution
    • Only traits controlled by genes can be affected by natural selection
    =
  • How do new Species form?
    • Geographic isolation = individuals remain separated from the rest of their species long enough to develop new traits.
  •  
  • Continental Drift
    • Continental drift is geographic isolation that occurred on a massive world-wide scale.