Evolution: Constant Change and Common Threads

Lecture 2 – Selection in Action

by David M. Kingsley, PhD

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  1.  1.  Start of Lecture 2
  2.  2.  Introduction by HHMI Vice President Dr. Peter Bruns
  3.  3.  Introductory interview with Dr. David Kingsley
  4.  4.  Natural selection and artificial selection
  5.  5.  Artificial selection created corn (maize)
  6.  6.  Video: Corn and ancestral teosinte
  7.  7.  Ancient breeders selected seed and stalk traits
  8.  8.  Genetic archaeology: How corn was bred
  9.  9.  Mendelian inheritance pattern: A one-gene trait
  10. 10.  How many genes result in maize/teosinte differences?
  11. 11.  Only 4 to 5 genes changed to make corn from teosinte
  12. 12.  Single genes can radically change an organism
  13. 13.  Video: Dogs and selective breeding
  14. 14.  Breeding has generated many dog varieties
  15. 15.  The genetic basis of different dog skeletons
  16. 16.  A German shepherd – basset hound cross
  17. 17.  Genetic control of muzzle shape in dogs
  18. 18.  Summary of dog genetics
  19. 19.  Q&A: How much does modern genetics guide breeders?
  20. 20.  Q&A: Why different genes for upper/lower jaw formation?
  21. 21.  Q&A: How did corn breeders know what genes to change?
  22. 22.  Q&A: What problems arise from inbreeding dogs?
  23. 23.  Can natural selection create variation as breeders do?
  24. 24.  Video: The stickleback on "Jeopardy!"
  25. 25.  Ancestral sticklebacks spawned in freshwater streams
  26. 26.  Video: Environmental pressures led to stickleback evolution
  27. 27.  Adaptive radiation from ancestral form
  28. 28.  Adaptive changes in freshwater sticklebacks
  29. 29.  Crosses between stickleback forms reveal underlying genes
  30. 30.  Important varieties in wild stickleback populations
  31. 31.  Genetic basis for reduction in stickleback armor plating
  32. 32.  Genetic archaeology locates the plate-number gene
  33. 33.  Modifier genes also influence plate number
  34. 34.  Genetic engineering adds armor to a plateless stickleback
  35. 35.  Genetic control of stickleback hindfins
  36. 36.  Limb reduction has occurred in many vertebrates
  37. 37.  Animation: 3-D CT scan of stickleback skeleton
  38. 38.  Hindfin reduction controlled by major and modifier genes
  39. 39.  Artificial and natural selection give rise to variety
  40. 40.  Review of how quickly selection can act
  41. 41.  Q&A: Would domesticated dogs go extinct in the wild?
  42. 42.  Q&A: Are there inbreeding effects with F1 crosses?
  43. 43.  Q&A: Has artificial selection helped improve other crops?
  44. 44.  Q&A: What fish are used with the stickleback crosses?
  45. 45.  Q&A: Are dogs still closely related to wolves?
  46. 46.  Closing remarks from HHMI Vice President Dr. Peter Bruns


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