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The Evolution of Natural Selection: Understanding Change Over Time

This article explores the concept of evolution and natural selection, highlighting how traits are inherited and change over generations. Before the 1800s, the understanding of evolution was limited, with many believing in a young Earth based on biblical interpretations. Key figures like Lamarck and Darwin challenged these views, proposing that organisms evolve over time through natural selection, where those best suited to their environment survive and reproduce. The transition from outdated beliefs to scientific understanding marks a significant milestone in evolutionary biology.

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The Evolution of Natural Selection: Understanding Change Over Time

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  1. Evolution:Natural Selection

  2. Evolution • Change in inherited characteristics over time. (Descent with modification)

  3. Before the 1800’s few thought much about evolution • Most people thought the earth was only 6,000 years old (not 4.6 billion years old)

  4. 2. Few traveled to see similarities in species

  5. 3. Many people (of European descent) understood only the biblical story of creation. http://mythicjourneys.org/bigmyth/

  6. In the 1800’s scientists started to change people’s minds….

  7. Lamarck • A French scientist who proposed that traits developed during a parent’s life would be passed onto their kids.

  8. Example: giraffes stretch their neck to reach tall leaves, this results in a long neck. This trait is then inherited by the kids.

  9. Lamarck didn’t realize not all things are passed onto the offspring =

  10. Plastic Surgery does NOT get passed onto your offspring! Before surgery After surgery

  11. Genetics wasn’t described until the 1860’s by Mendel

  12. Charles Darwin • A British scientist who studied nature and noticed similarities among animals.

  13. He concluded that living things must be related and somehow they changed, or evolved, over time due to natural selection.

  14. Natural Selection • An organism with the best traits for their environment is more likely to survive and reproduce Which mouse is better suited for this environment?

  15. Survival of the Fittest • Which moth has the best traits for this environment? • What will happen to the “unfit” moth?

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