Evolution

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Theories, Evidences and Patterns of Evolution

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Evolution

  1. 1. Isabel V. Neri
  2. 2. What is Evolution?  It is the gradual change from one form to another through a period of time.
  3. 3. Lamarck’s Theory Darwin’s Theory
  4. 4. Lamarck’s Theory  Jean Baptist de Lamarck
  5. 5. Lamarck’s Theory  Acquired traits can be inherited  He proposed that: Organisms change as their environment changes
  6. 6. Darwin’s Theory  Charles Darwin
  7. 7. Darwin’s Theory  Published “Origin of Species”  Traveled around the world in the Beagle  He proposed that: Organisms produce more offsprings than the available resources can support Organisms fight for limited resources like food, territory, and other necessities of life. Only those who survive can produce their own offspring
  8. 8. Variation exists within species. For example, some gorillas have longer arms than others. Natural Selection - The environment selects organisms with beneficial traits. Adaptation
  9. 9. Adaptation
  10. 10. Adaptation
  11. 11. Lamarck vs Darwin Jean Baptist de Lamarck Charles Darwin 1809 1859 French Naturalist English Naturalist Acquired traits can be inherited by an organism Organism adapts to changes in the environment. Only the fittest organisms survive through natural selection.
  12. 12. EVOLUTION NATURAL SELECTION ADAPTATION
  13. 13. EVOLUTION NATURAL SELECTION ADAPTATION
  14. 14. Gradual change from one form to another through a period of time The environment selects organisms with beneficial traits A form modified to fit a changed environment
  15. 15. Evidences of Evolution  Any preserved part or tissue of an organism that once lived. FOSSIL
  16. 16. CASTS MOLDS IMPRINTS PETRIFIED FOSSILS
  17. 17. Biochemical Evidences  Indicate that some organisms have similar DNA sequences, which suggest common ancestry DNA
  18. 18. VARIATION
  19. 19. Divergent Evolution
  20. 20. Convergent Evolution

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