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Evolution   by  Natural Selection
LaMarck ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Charles Darwin ,[object Object],[object Object],[object Object],[object Object],[object Object]
Darwin studied unique species on the Galapagos Islands
Darwin found… birds ,[object Object],Finch? Sparrow? Woodpecker? Warbler? Thought he found  very different kinds… Finch? Sparrow? Woodpecker? Warbler?
[object Object],But Darwin found… a lot of  finches Sparrow? Large Ground  Finch Small Ground  Finch Warbler  Finch Veg. Tree  Finch But  there is only  one  species of finch on the mainland! How did one species  of finches become so many different species now?
Tree Thinking Large-seed eater? Small-seed eater? Warbler? Leaf-browser? Large Ground Finch Small Ground Finch Warbler Finch Veg. Tree Finch Ancestral species—1 finch from the mainland Descendant species—many finch species on the islands
Correlation of finch species to food source Adaptive radiation Seed eaters Flower eaters Insect eaters Rapid  speciation : new species filling new  niches , because they inherited successful adaptations.
Darwin’s finches ,[object Object],[object Object],[object Object],Warbler finch Woodpecker finch Small insectivorous tree finch Large insectivorous tree finch Vegetarian tree finch Cactus finch Sharp-beaked finch Small ground finch Medium ground finch Large  ground finch Insect eaters Bud eater Seed eaters Cactus eater Warbler finch Tree finches Ground finches
Darwin’s finches ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Seeing this gradation &  diversity of structure in  one small, intimately related group of birds,  one might really fancy that  from the original gene pool of birds  in this archipelago,  one species has been taken &  modified for different ends.
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Darwin’s finches
Correlation of species  to food source Whoa, Turtles, too !   More observations…
Evolution by Natural Selection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Artificial selection This is not just a process of the past… It is all around us today
Selective breeding the raw genetic material (variation) is hidden there
Selective breeding ,[object Object]
A Reluctant R evolution ary  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],Voyage: 1831-1836 “ On the Origin of Species by Means of Natural Selection”
Essence of Darwin’s ideas ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Restated… (5)  Over long periods of time, and given a steady input of new variation into a population, these processes lead to the  emergence of new species ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
LaMarckian vs. Darwinian view ,[object Object],[object Object],[object Object],[object Object],

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1. Natural Selection

  • 1. Evolution by Natural Selection
  • 2.
  • 3.
  • 4. Darwin studied unique species on the Galapagos Islands
  • 5.
  • 6.
  • 7. Tree Thinking Large-seed eater? Small-seed eater? Warbler? Leaf-browser? Large Ground Finch Small Ground Finch Warbler Finch Veg. Tree Finch Ancestral species—1 finch from the mainland Descendant species—many finch species on the islands
  • 8. Correlation of finch species to food source Adaptive radiation Seed eaters Flower eaters Insect eaters Rapid speciation : new species filling new niches , because they inherited successful adaptations.
  • 9.
  • 10.
  • 11. Seeing this gradation & diversity of structure in one small, intimately related group of birds, one might really fancy that from the original gene pool of birds in this archipelago, one species has been taken & modified for different ends.
  • 12.
  • 13. Correlation of species to food source Whoa, Turtles, too ! More observations…
  • 14.
  • 15. Artificial selection This is not just a process of the past… It is all around us today
  • 16. Selective breeding the raw genetic material (variation) is hidden there
  • 17.
  • 18.
  • 19.
  • 20.
  • 21.
  • 22.

Hinweis der Redaktion

  1. Lamarck noted how well-adapted organisms were to their environments, and believed that fossils could be understood as less perfect forms which had perished in the struggle for increasing perfection. He explained adaptation as a result of change caused by environmental pressures.
  2. What did Darwin say? What evidence supports Evolution by Natural Selection? What impact did Evolution have on biology?
  3. Show Campbell videos!!!
  4. Darwin noted that the plants and animals of South America were very distinct from those of Europe. Organisms from temperate regions of South America were more similar to those from the tropics of South America than to those from temperate regions of Europe. Further, South American fossils more closely resembled modern species from that continent than those from Europe.