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The Evolution Theory: Lamarck, Darwin, Natural Selection

Explore Lamarck's beliefs, Darwin's journey to the Galapagos Islands, adaptation in species, and the concept of natural selection in the modern theory of evolution. Understand how genetic changes occur over time, influencing species diversity. Engage with questions about species differentiation and adaptation. Complete the worksheet for a deeper understanding.

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The Evolution Theory: Lamarck, Darwin, Natural Selection

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Presentation Transcript

  1. The Modern Theory of Evolution Mr. Modafferi

  2. Do Now • What did Lamarck believe?

  3. Darwin’s Journey

  4. The Galapagos Islands • Volcanic islands off the South American coast • Island species varied from the mainland species, and from island-to-island • Example: Each island had either long or short necked tortoises depending on the island’s vegetation (Their shells also varied)

  5. Finches! • Finches on the Galapagos Islands resembled a mainland finch, but there were more types • Bill shapes are adaptations to different means of gathering food. • Galapagos finch species varied by nesting site, beak size, and eating habits.

  6. Think BIGGER! • Newer species are just descendants of older species GEICO Cave Man Mr. Modafferi

  7. Why are there different species? • Darwin believes that once the organisms got to the island they reproduced, and eventually their offspring became different than the original mainland animals • Evolution is linked to genes that are passed on through reproduction!

  8. Adaptation • Adaptation - is a trait that helps an organism be more suited to its environment

  9. How and When do These Changes/Adaptations Occur • Evolutionary changes occur over time • Evolutionary change only occurs in the genes of sex cells • Adaptations can be in structure, function, and behavior over time

  10. Question of the Day • Why do you think a species would change? • Why are there different turtles on the Galapagos Islands? • Why are there different Finches on South America and the Galapagos Islands?

  11. Natural Selection • Natural Selection = Survival of the Fittest • This is the major idea to the modern theory of evolution

  12. Natural Selection Cont. • The environment acts as the selecting agent • Natural occurring variations among members of a population make some of them better adapted to the environment to survive.

  13. Homework • Finish Worksheet

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