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Evolution First theories: Lamarck. Use pg. 283 in your book… Who is Lamarck and how did he think species changed over time?. Evolution. Definition: Change that occurs over time. Change can happen for many reasons To help eat or catch food To help avoid predators

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slide2

Use pg. 283 in your book…

Who is Lamarck and how did he think species changed over time?

evolution
Evolution
  • Definition: Change that occurs over time.
  • Change can happen for many reasons
    • To help eat or catch food
    • To help avoid predators
    • To help attract a mate better
theories of evolution
Theories of Evolution
  • Lamarck
    • Hypothesis of “Use and Disuse”
    • Believed that traits were passed on that were used, and others were not passed on that were not used.
slide5

Lamarck believed that traits were acquired.

  • Acquired traits are characteristics (traits) that you develop as you live.
  • You are not born with acquired traits
  • Acquired traits are not in your DNA
  • Lamarck believed that they could be passed on to offspring through his hypothesis of use and disuse
slide6

According to Lamarck’s hypothesis on evolution, how did giraffes get their long necks?

Why do all giraffes

now have long

necks?