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Natural Selection Lab

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 . History. Ideas about evolution originated before Darwin Aristotle Fossils Jean Baptiste de Lamarck

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Natural Selection Lab

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  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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