Week 33Mechanics of EvolutionWhat’s behind the curtain?    Ch. 15.2 pg 404
gene pool                           geneAll the genes (alleles) in a       DNA segment that controls   population Darwin A...
allelic frequency   The percentage of an allele      in the gene pool
genetic equilibrium   When the frequency of alleles remains the    same over generations
   The change of allelicgenetic drift       frequencies by unusual events,                    disrupting a population’s  ...
stabilizing selection   natural selection that favors average    individuals in a population
directional selection   natural selection that favors individuals    with an extreme variation of a trait
disruptive selection   natural selection that favors individuals    with either extreme variation of a trait,    eliminat...
speciation   Evolution of a new species                  extinct
geographic isolation   Occurs whenever a physical barrier    divides a population
reproductive isolation   Occurs when formerly interbreeding organisms    can no longer mate and produce fertile offspring...
polyploidy   multiple of the    normal set (2n) of    chromosomes due    to mistakes in    mitosis or meiosis            ...
gradualism   Idea that    species    originate    though a    gradual    change of    adaptations
punctuated equilibrium   Idea    speciation    occurs    relatively    quickly in    rapid bursts    with long    periods...
adaptive radiation   When an    ancestral    species    evolves into    an array of    species to fit    number of    div...
divergent evolution   species that once were similar to an    ancestral species diverge (become    increasingly DIFFERENT)
convergent evolution   When unrelated species evolve similar    traits
Report on           an example of        convergent evolution       and divergent evolution                  or           ...
And now the quiz
1. ___________ selection   natural selection that favors individuals    with an extreme variation of a trait
   The change of allelic2       frequencies by unusual events,        disrupting a population’s        genetic equilibriu...
3 _________ selection   natural selection that favors average    individuals in a population
4 _________ selection   natural selection that favors individuals    with either extreme variation of a trait,    elimina...
5_________ isolation   Occurs whenever a physical barrier    divides a population
6________ isolation   Occurs when formerly interbreeding organisms    can no longer mate and produce fertile offspring,  ...
7 ____________ radiation   When an    ancestral    species    evolves into    an array of    species to fit    number of ...
8 __________ evolution   The pattern of evolution in which species that    once were similar to an ancestral species    d...
9_________ evolution   When unrelated species evolve similar    traits
10   Evolution of a new species                  extinct
11 _________ ________   The percentage of an allele      in the gene pool
12 ______ ______   When the frequency of alleles remains the    same (equal) over generations
13   multiple of the    normal set (2n) of    chromosomes due    to mistakes in    mitosis or meiosis    Examples    Trip...
14   Idea that    species    originate    though a    gradual    change of    adaptations
15All the genes (alleles) in a       DNA segment that controls   population Darwin Award video     protein production and ...
16   Idea    speciation    occurs    relatively    quickly in    rapid bursts    with long    periods of    genetic    eq...
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B33 ppt mechanics of evolution ch 15.2

  1. 1. Week 33Mechanics of EvolutionWhat’s behind the curtain?  Ch. 15.2 pg 404
  2. 2. gene pool geneAll the genes (alleles) in a DNA segment that controls population Darwin Award video protein production and cell cycle
  3. 3. allelic frequency The percentage of an allele in the gene pool
  4. 4. genetic equilibrium When the frequency of alleles remains the same over generations
  5. 5.  The change of allelicgenetic drift frequencies by unusual events, disrupting a population’s genetic equilibrium  ex. extra fingers and toes due to inbreeding
  6. 6. stabilizing selection natural selection that favors average individuals in a population
  7. 7. directional selection natural selection that favors individuals with an extreme variation of a trait
  8. 8. disruptive selection natural selection that favors individuals with either extreme variation of a trait, eliminating intermediate phenotypes
  9. 9. speciation Evolution of a new species extinct
  10. 10. geographic isolation Occurs whenever a physical barrier divides a population
  11. 11. reproductive isolation Occurs when formerly interbreeding organisms can no longer mate and produce fertile offspring, due to change in genetic material or behavior
  12. 12. polyploidy multiple of the normal set (2n) of chromosomes due to mistakes in mitosis or meiosis Tetraploid (4n) Examples of Polyploid Crops Triploid (3n) crops: banana, apple, ginger, watermelon, citrus[11] Tetraploid (4n) crops: durum or macaroni wheat, maize, cotton, potato, cabbage, leek, tobacco, peanut Hexaploid (6n) crops: chrysanthemum, bread wheat, oat, kiwifruit Octaploid (8n) crops: strawberry, dahlia, pansies, sugar cane
  13. 13. gradualism Idea that species originate though a gradual change of adaptations
  14. 14. punctuated equilibrium Idea speciation occurs relatively quickly in rapid bursts with long periods of genetic equilibrium in between
  15. 15. adaptive radiation When an ancestral species evolves into an array of species to fit number of diverse habitats
  16. 16. divergent evolution species that once were similar to an ancestral species diverge (become increasingly DIFFERENT)
  17. 17. convergent evolution When unrelated species evolve similar traits
  18. 18. Report on an example of convergent evolution and divergent evolution or examples ofstablizing, directional, and disruptive selection
  19. 19. And now the quiz
  20. 20. 1. ___________ selection natural selection that favors individuals with an extreme variation of a trait
  21. 21.  The change of allelic2 frequencies by unusual events, disrupting a population’s genetic equilibrium  ex. extra fingers and toes due to inbreeding
  22. 22. 3 _________ selection natural selection that favors average individuals in a population
  23. 23. 4 _________ selection natural selection that favors individuals with either extreme variation of a trait, eliminating intermediate phenotypes
  24. 24. 5_________ isolation Occurs whenever a physical barrier divides a population
  25. 25. 6________ isolation Occurs when formerly interbreeding organisms can no longer mate and produce fertile offspring, due to change in genetic material or behavior
  26. 26. 7 ____________ radiation When an ancestral species evolves into an array of species to fit number of diverse habitats
  27. 27. 8 __________ evolution The pattern of evolution in which species that once were similar to an ancestral species diverge (become increasingly district)
  28. 28. 9_________ evolution When unrelated species evolve similar traits
  29. 29. 10 Evolution of a new species extinct
  30. 30. 11 _________ ________ The percentage of an allele in the gene pool
  31. 31. 12 ______ ______ When the frequency of alleles remains the same (equal) over generations
  32. 32. 13 multiple of the normal set (2n) of chromosomes due to mistakes in mitosis or meiosis Examples Triploid (3n) crops: banana, apple, ginger, watermelon, citrus[11] Tetraploid (4n) crops: durum or macaroni wheat, maize, cotton, potato, cabbage, leek, tobacco, peanut Hexaploid (6n) crops: chrysanthemum, bread wheat, oat, kiwifruit Octaploid (8n) crops: strawberry, dahlia, pansies, sugar cane
  33. 33. 14 Idea that species originate though a gradual change of adaptations
  34. 34. 15All the genes (alleles) in a DNA segment that controls population Darwin Award video protein production and cell cycle
  35. 35. 16 Idea speciation occurs relatively quickly in rapid bursts with long periods of genetic equilibrium in between

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