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The Evolutionary Journey Through Natural Selection

Explore the intriguing history and concepts of evolution, from Aristotle's early ideas to Darwin's groundbreaking theories on natural selection and the synthetic theory of evolution. Discover fossils, influential figures, and the impact of artificial and natural selection in shaping the diversity of life on Earth.

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The Evolutionary Journey Through Natural Selection

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Presentation Transcript

  1. Natural Selection Lab By Jane Horlings I’iwi,Hawaiian honeycreeper Passenger pigeon, which became extinct in the early 1900s due to human hunting Archaeopteryx fossil

  2. History • Ideas about evolution originated before Darwin • Aristotle • Fossils • Jean Baptiste de Lamarck • Inheritance of acquired characteristics Aristotle (UL), Ammonite fossil (UR), Lamarck (L)

  3. History • Lamarck • Characteristics which an organism developed during its lifetime were inherited • Now known to be invalid

  4. History • Charles Darwin • H.M.S. Beagle • South America & the Galapagos Islands H.M.S. Beagle (U), Galapagos turtle (LL), Darwin at early age (LR)

  5. History

  6. History • Finches in the Galapagos

  7. History • Other scientists and research influenced Darwin’s theory • Charles Lyell: Principles of Geology Lyell

  8. History • Economist Thomas Malthus

  9. History • Alfred Russel Wallace Wallace, early (R), and later in life (L)

  10. History • Darwin proposed that evolution occurs by natural selection • On the Origin of Species by Means of Natural Selection published in 1859

  11. History • Darwin's theory had four parts: 1. Organisms produce more offspring than can survive to reproductive age 2. Members of a population vary and some of these variations are heritable • Resources available to a population are limited • Organisms with the most favorable traits have differential reproductive success, and those traits are passed to the next generation

  12. History • The synthetic theory of evolution or Neo-Darwinism Darwin (R), Mendel (L)

  13. History Darwin in cartoon from 1800s Darwin died in 1882

  14. Selection • Selection = when some individuals leave behind more offspring than others, and the rate at which they do so is affected by their inherited characteristics • Selection can be artificial or natural Peppered moth

  15. Selection • Artificial selection

  16. Selection • Biotechnology / Genetic engineering

  17. Selection • Natural selection • Natural selection is the result of differential reproduction by members of a population • “Reproduction of the fittest!”

  18. Selection See? The offspring in the last generation now all have the gene allowing them to be resistant to the pesticide! This is a great example of selection!

  19. End

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