Evolution of complex traits

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Evolution of complex traits

  1. 1. Notes: Evolution of Complex Traits(pg8)
  2. 2. Notes: Evolution of Complex Traits(pg8)• Complex Traits include structures or systemswith multiple interacting parts
  3. 3. Notes: Evolution of Complex Traits(pg8)• Complex Traits include structures or systemswith multiple interacting parts• Examples: Eyes, blood clotting, flagella
  4. 4. Notes: Evolution of Complex Traits(pg8)• Complex Traits include structures or systemswith multiple interacting parts• Examples: Eyes, blood clotting, flagella
  5. 5. • Opponents of evolution say that some traitsare “irreducibly complex” and could not haveevolved through small changes
  6. 6. • Opponents of evolution say that some traitsare “irreducibly complex” and could not haveevolved through small changes• However, biologists have shown that this isnot true
  7. 7. Evolution can produce very complex traitsbecause:
  8. 8. Evolution can produce very complex traitsbecause:1. Natural selection allows small beneficialchanges to accumulate over time
  9. 9. Evolution can produce very complex traitsbecause:1. Natural selection allows small beneficialchanges to accumulate over timeExample: Eyes
  10. 10. Evolution can produce very complex traitsbecause:1. Natural selection allows small beneficialchanges to accumulate over timeExample: Eyes2. Traits may have had a different function in thepast
  11. 11. Evolution can produce very complex traitsbecause:1. Natural selection allows small beneficialchanges to accumulate over timeExample: Eyes2. Traits may have had a different function in thepastExample: Lungs (for breathing) evolved fromswim bladders (for floatation)

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