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Origin of Life

Origin of Life. Remember:. Origin: Early Ideas. Spontaneous Generation: Francisco Redi. Redi’s Experiment:. Not REJECTED until mid-1800’s. Theory of Biogenesis:. Only living organisms can produce other living organisms. *Experiment done by Louis Pasteur. Pasteur’s Experiment:.

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Origin of Life

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  1. Origin of Life

  2. Remember: Origin: Early Ideas • Spontaneous Generation: Francisco Redi

  3. Redi’s Experiment: Not REJECTED until mid-1800’s

  4. Theory of Biogenesis: • Only living organisms can produce other living organisms. *Experiment done by Louis Pasteur

  5. Pasteur’s Experiment: Broth is freeof microorganismsfor a year. Curved neck isremoved. Broth is teeming with microorganisms. Broth isboiled Conclusively disproved the hypothesis of spontaneous generation

  6. Big Bang Theory • Theory about origin of the universe (Earth) • Universe formed approx. 13.7 billion years ago

  7. Earth’s Early History • Densest elements pulled to core – gravity • Many meteorites

  8. When did “life” begin? • Approx. 3.5 – 3.9 billion years ago • 1st organisms were prokaryotic & lived in extreme conditions

  9. How did “life” begin? • Theory: explanation of a natural phenomenon based on many observations & experiments

  10. 1.Extraterrestrial Origin • Asteroid…not alien • Carried amino acids 3.5 byo fossilized cyanobacteria

  11. 2. Primordial Soup Energy + Atoms = Life

  12. C H N O P S 2. Primordial Soup (cont) • 97% of organisms contains the elements • These elements combine to form “life” ingredients

  13. Miller-Urey Experiment • Water • Methane • Ammonia • Hydrogen RESULT = Amino Acids

  14. Hydrothermal Vents

  15. Hydrothermal Vents • Modern prokaryotes called “archaea” are the closest living relatives of Earth’s first cells. • Found:hot springs or volcanic vents in the deep sea.

  16. Creation • Religious, not scientific theory

  17. Endosymbiotic Theory: Eukaryotes formed from asymbioticrelationship with several differentprokaryotic organisms.

  18. Endosymbiotic Theory:

  19. Endosymbiotic Theory: • Lynn Margulis – 1960’s • Evidence: mitochondria and chloroplast similar DNA to bacteria.

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