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More Evolution: who, what, how Exam key posted on class webpage Check out Bonuses on class webpage

More Evolution: who, what, how Exam key posted on class webpage Check out Bonuses on class webpage. Evolution: A species’ genetic component changes as the individuals reproduce. These changes are based on how the DNA changes and who reproduces.

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More Evolution: who, what, how Exam key posted on class webpage Check out Bonuses on class webpage

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  1. More Evolution:who, what, how • Exam key posted on class webpage • Check out Bonuses on class webpage

  2. Evolution: A species’ genetic component changes as the individuals reproduce. These changes are based on how the DNA changes and who reproduces.

  3. Reproductive success = evolutionary success

  4. Evolution can occur via several processes. One common process isNatural Selection: Individuals that are most successful at reproducing will pass on more of their genetic information.

  5. Natural Selection can only occur when both of these conditions are met: • Genetic diversity gives rise to individuals with different traits and • Not all individuals can reproduce equally

  6. Evolution: A species’ genetic component changes as the individuals reproduce. These changes are based on how the DNA changes and who reproduces.

  7. Individuals are selected… But species evolve via changes in DNA during reproduction.

  8. Fig 24.6 Who evolves?…Species. A. leucurus A. harrisi • A population that can produce fertile offspring • A population that does reproduce **A population sharing genetic information**

  9. X Horse Donkey = Mule

  10. X Horse Donkey So…horses and donkeys are not the same species. = Mule (sterile)

  11. Fig 24.6 Who evolves?…Species. A. leucurus A. harrisi • A population that can produce fertile offspring • A population that does reproduce **A population sharing genetic information**

  12. Fig 22.19 How does evolution occur?

  13. Fig 22.19 Divergent Evolution

  14. Fig 22.20 Convergent Evolution

  15. Evolution has no goal...no ultimate life form wrongright

  16. Individuals that are most successful at reproducing will pass on more of their genetic information. Natural Selection:

  17. Environmental changes drive evolution.

  18. 250 mya 180 mya Fig 25.13 Plate Tectonics 135 mya 65 mya current

  19. The environment is in constant flux

  20. Fig 24.5 Changing environment can separate populations and lead to new species…

  21. Fig 24.9 Separation does not need to be geographic Flies raised in different environments prefer to mate with individuals from the same environment...

  22. Flies raised in different environments prefer to mate with individuals from the same environment... Fig 24.9

  23. Three basic types of selection… • Directional • Stabilizing • Disruptive

  24. Next even more Evolution:Types of Selection and Randomness • Exam key posted on class webpage • Check out Bonuses on class webpage

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