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Theories of Evolution

Theories of Evolution. 1) Lamarck. French scientist Late 1700’s- early 1800’s “acquired traits” (use it or lose it) theory traits are not determined by genes but by “need” EX: giraffe necks grow longer because they stretch to reach the leaves higher up. . 2) Charles Darwin.

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Theories of Evolution

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  1. Theories of Evolution

  2. 1) Lamarck • French scientist • Late 1700’s- early 1800’s • “acquired traits” (use it or lose it) theory traits are not determined by genes but by “need” EX: giraffe necks grow longer because they stretch to reach the leaves higher up.

  3. 2) Charles Darwin • English scientist • Developed his theory of “natural selection” in the mid 1800’s • Was a naturalist on the HMS Beagle (traveled around the world, mostly the southern hemisphere) for 5 years.

  4. Voyage of the HMS Beagle

  5. Darwin Noticed organisms had some similarities even when they lived far apart. * Darwin’s Finches Kept records & collected specimens Published “The Origin of Species…”

  6. Darwin’s Finches

  7. Darwin read other published works: 1) Larmarck’s Theory 2) Lyell’s book on Geology 3) Malthus’ book on human population & economics

  8. Natural Selection Nature selects those that are best adapted to survive. “Survival of the Fittest” Adaptive advantage = a favorable trait

  9. Write the following questions: • What kinds of organisms lived on Earth before humans? • What is evolution? • What can we learn by studying fossils? • What conditions are necessary for the creation of life? • What happened when the enormous asteroid hit Earth 65 million years ago? • Describe the concept of Natural selection in your own words. • What do you think the relationship is between humans & primates?

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