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Evolution
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Evolution

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presentation for AP Biology course

presentation for AP Biology course

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  • 1. Evolution not just a theory
  • 2. Miller-Urey, 1953
    • amino acids, sugars, etc. were produced
    • other mixtures led to formation of nucleotide bases
  • 3. Protenoids
    • heating organic components to high temps results in structures with a protein like properties (Fox)
    • some engaged in enzyme like behavior (splitting and bonding)
    • some in hormone-like behavior (melanin production)
    • when allowed to cool, some developed a double membrane and selective permeability
    • different in many ways from actual proteins, however
  • 4. “ Self-Assembly”
    • take the proteins and nucleic acid components of the tobacco mosaic virus together in the right conditions and they spontaneously aggregate into the structure needed to produce the virus
    • components of ribosomes will self-aggregate (Nomura)
    • components of RNA will self-aggregate
    • synthetic RNA will self-replicate (Joyce)
  • 5. Endosymbiont Hypothesis
    • Chloroplasts and Mitochondria:
    • have their own DNA and their own ribosomes
  • 6. Endosymbiont Hypothesis
    • Chloroplasts and Mitochondria:
    • have their own DNA and their own ribosomes
    ribosome structure is different than the ribosomes of eukaryotes
  • 7. Endosymbiont Hypothesis
    • Chloroplasts and Mitochondria:
    • have their own DNA and their own ribosomes
    • reproduce independently of the cell
    ribosome structure is different than the ribosomes of eukaryotes
  • 8. Endosymbiont Hypothesis
    • Chloroplasts and Mitochondria:
    • have their own DNA and their own ribosomes
    • reproduce independently of the cell
    • cells have no other way to make them
    ribosome structure is different than the ribosomes of eukaryotes
  • 9. Endosymbiont Hypothesis (cont’d)
    • Chloroplasts and Mitochondria have structural similarities to:
  • 10. Endosymbiont Hypothesis (cont’d)
    • Chloroplasts and Mitochondria have structural similarities to:
    cyanobacteria
  • 11. Endosymbiont Hypothesis (cont’d)
    • Chloroplasts and Mitochondria have structural similarities to:
    cyanobacteria bacteria
  • 12. Endosymbiont Hypothesis (cont’d)
    • Chloroplasts and Mitochondria have structural similarities to:
    cyanobacteria (autotrophs) bacteria (heterotrophs) Hypothesis : chloroplasts and mitochondria are descendents of some kind of ancient bacteria
  • 13. Sugar Rays: the evolution of photosynthesis
    • http://www.pubinfo.vcu.edu/secretsofthesequence/search_frame.asp
    click the black box to begin movie
  • 14. end of part 1
  • 15. part 2
  • 16. Darwin’s theory of evolution by natural selection
  • 17. Overproduction populations tend to produce more offspring than are needed Variation individuals within a population vary in their phenotype and therefore their genotype Natural Selection some variants will be favored in a particular environment while others might be disfavored Evolution each new generation will contain proportionally more descendents from individuals with favorable characteristics
  • 18. Individuals do NOT evolve!!! . . . but populations do.
  • 19.