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Chapter 16

Chapter 16. Darwin’s Theory of Evolution. 16.1 – Darwin’s epic Journey. Scientific views of the natural world were changing Darwin 2/12 / 1809 Was the earth older? Had it changed? Evolution – change over time (natural selection) Common ancestors. 16.1 – Darwin’s epic Journey.

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Chapter 16

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  1. Chapter 16 Darwin’s Theory of Evolution

  2. 16.1 – Darwin’s epic Journey • Scientific views of the natural world were changing • Darwin 2/12/1809 • Was the earth older? • Had it changed? • Evolution – change over time (natural selection) • Common ancestors

  3. 16.1 – Darwin’s epic Journey • Started voyage in 1831 • Naturalist • Collect and measure specimens of plants and animals • Fossil • Artificial Selection Master and Commander Of the Far Side of the World

  4. 16.3 Darwin presents his case • Evolution by Natural Selection • 16.2 People that influenced Darwin • Remember that Darwin lived in a skeptical age • Many of his ideas…..well • The Struggle for Existence • Variation and Adaptation • Survival of the Fittest • Fitness • Natural Selection – See Fig. 16-10

  5. 16.3 Darwin presents his case • Common Descent • All species, living and extinct are descended from ancient common ancestors

  6. 16.4 Evidence of Evolution • Biogeography • Where organisms lived now and where they and their ancestors lived in the past. • Closely related but different • Distantly related but similar • Different ancestors

  7. 16.4 Evidence for Evolution • The Age of the Earth and Fossils • Determining the earth’s age • Gaps • The Age of the Earth • Radioactive Dating • Issues • Recent Fossil Finds • Trace modern to ancient

  8. 16.4 Evidence for Evolution • Comparing Anatomy and Embryology • Homologous Structures • Can be plants or animals • Similar build, different function • Very similar = common ancestor • Vestigial Structures • Inherited but minimal if any function

  9. 16.4 Evidence for Evolution • Embryology • Study the embryo including its structure • Similar =? Common ancestor. • Remember Hox Genes? • Genetics and Molecular Biology • DNA the strongest evidence? • Remember that the basis of DNA is the same in us all.

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