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Find a new group

Find a new group. Add a title page called EVOLUTION to your notebook Annotate article Get ready for entrance quiz. Finish graphing and writing. Environment Predator Variation Competition Adaptation Offspring DNA Population Traits Survival Disturbance. Test Results. Chapter 22~.

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Find a new group

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  1. Find a new group • Add a title page called EVOLUTION to your notebook • Annotate article • Get ready for entrance quiz

  2. Finish graphing and writing • Environment • Predator • Variation • Competition • Adaptation • Offspring • DNA • Population • Traits • Survival • Disturbance

  3. Test Results

  4. Chapter 22~ Descent with Modification: A Darwinian View of Life

  5. Evolution Evolution: the change over time of the genetic composition of populations Natural selection: populations of organisms can change over the generations if individuals having certain heritable traits leave more offspring than others (differential reproductive success) Evolutionary adaptations: a prevalence of inherited characteristics that enhance organisms’ survival and reproduction November 24, 1859

  6. mya 1.5 Plants Birds 63 Mammals 135 Reptiles Seed Plants Flowering Amphibians Insects Dinosaurs 180 Teleost Fish Land Plants Jawless Fish 225 Chordates Molluscs Arthropods 280 Multicellular Animals Green Algae 350 Photosynthetic Bacteria Anaerobic Bacteria 400 430 500 570 700 4500 Life’s Natural History is a record of Successions & Extinctions

  7. Evolutionary history Linnaeus: taxonomy Hutton: gradualism Lamarck: evolution Malthus: populations Cuvier: paleontology Lyell: uniformitarianism Darwin: evolution Mendel: inheritance Wallace: evolution

  8. Charles Darwin 1809-1882 British naturalist Proposed the idea of evolution by natural selection Collected clear evidence to support his ideas

  9. Voyage of the HMS Beagle Invited to travel around the world 1831-1836 (22 years old!) makes many observations of nature main mission of the Beagle was to chart South American coastline • Stopped in Galapagos Islands • 500 miles off coast of Ecuador

  10. Darwin found… birds Collected many different birds on the Galapagos Islands. Finch? Sparrow? Warbler? Woodpecker? Finch? Sparrow? Thought he found very different kinds… Warbler? Woodpecker?

  11. Darwin was amazed to find out: All 14 species of birds were finches… But Darwin found… a lot of finches Finch? Sparrow? Warbler? Woodpecker? But there is only one species of finch on the mainland! Large Ground Finch Small Ground Finch Finch? Sparrow? How didone species of finches becomeso many differentspecies now? Warbler Finch Veg. Tree Finch Warbler? Woodpecker?

  12. Differences in beaks associated with eating different foods survival & reproduction of beneficial adaptations to foods available on islands Darwin’s finches Warbler finch Cactus finch Woodpecker finch Sharp-beaked finch Small insectivorous tree finch Small ground finch Warbler finch Large insectivorous tree finch Cactus eater Mediumground finch Tree finches Ground finches Insect eaters Seed eaters Vegetarian tree finch Large ground finch Bud eater

  13. Darwin’s finches Darwin’s conclusions small populations of original South American finches landed on islands variation in beaks enabled individuals to gather food successfully in the different environments over many generations, the populations of finches changed anatomically & behaviorally accumulation of advantageous traits in population emergence of different species

  14. Seeing this gradation & diversity of structure in one small, intimately related group of birds, one might really fancy that from an original paucity of birds in this archipelago, one species has been taken & modified for different ends.

  15. Differences in beaks allowed some finches to… successfully compete successfully feed successfully reproduce pass successful traits onto their offspring Darwin’s finches

  16. Correlation of species to food source More observations… Whoa,Turtles, too!

  17. Essence of Darwin’s ideas Natural selection variationexists in populations over-production of offspring more offspring than the environment can support competition for food, mates, nesting sites, escape predators differential survival successful traits = adaptations differential reproduction adaptations become more common in population

  18. Dispatch • What is your plan to bring up your grade in this class? • Make a pile of lab books. PUT A POST IT WHERE I AM CORRECTING • Take out ECOLOGY TEST and look at what you missed

  19. 26. D 27. C 28. C 29. E 30. B 31. D 32. C 33. C 34. C 35. B 36. E 37. B 38. C 39. A 40. D 41. C 42. C 43. D or C 44. E 45. E • 1. C • 2. D • 3. B • 4. B • 5. A • 6. C • 7. A • 8. B or E • 9. D • 10. B • 11. A • 12. E • 13. A • 14. A • 15. C • 16. C • 17. E • 18. B • 19. A • 20. A • 21. E • 22. D • 23. D • 24. B • 25. C

  20. 4 stations • Fossils • DNA • Embryos • Homologous Structures

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