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Evolution PowerPoint Presentation

Evolution

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Evolution

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Presentation Transcript

  1. Evolution

  2. Age of Universe • Estimate: 15 Billion Years! • Earth: 4.6 billion years old

  3. Evolution of Theory • Definition • Early Views • Greek philosophers • Judeo-Christian view • “Chain of Being” • Carolus Linnaeus (1707-1778) • fixity of species • taxonomy

  4. Theory of Evolution (cont.) • Jean Baptiste Lamarck (1744-1829) • inheritability • Catastrophism • Georges Cuvier (1769-1832) • Uniformitarianism (19th century) • Thomas Malthus • population biologist

  5. Theory of Evolution (cont.) • Charles Darwin (1809-1882) • English biologist/naturalist • 5 year world tour • H.M.S. Beagle • Galapagos Islands – Pacific Ocean near Ecuador • Finch Study • Natural Selection • Origin of Species (1859) • The Descent of Man (1871)

  6. Observed Examples of Natural Selection • Introduction • British Moths • DDT & House Flies • Antibiotics & Bacteria

  7. Heredity • Gregor Mendel (1822-1884) • Austrian monk / botanist • garden pea experiments • dominant and recessive • genotype vs. phenotype • Genes • units of heredity • alleles • homozygous vs. heterozygous • chromosomes

  8. Population Genetics • Mutation • major source of variability • Genetic Drift • random process in small populations • founder’s principle • Gene flow • gene sharing through sexual reproduction • cline

  9. Speciation • Definitions • species • speciation • Causes • separation • breeding times • mating displays / behavior • body structure • geographical barriers

  10. Evolution of Life • Analogy • no shared ancestry • phenotypes that evolved for similar purpose • convergent evolution • Homology • shared ancestry • parallel evolution • adaptive radiation

  11. Punctuated Equilibrium • Punctuated Equilibrium or Gradual Evolution?

  12. Continental Drift • Plate Tectonics • Pangea