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14-3: Origin of Heredity

14-3: Origin of Heredity. Hypothesis. Testable explanation to a problem or a question. Theory. Summarizes a hypothesis or group of hypotheses that have been supported with repeated testing. It is valid as long as there is no evidence to dispute it.

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14-3: Origin of Heredity

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  1. 14-3: Origin of Heredity

  2. Hypothesis • Testable explanation to a problem or a question

  3. Theory • Summarizes a hypothesis or group of hypotheses that have been supported with repeated testing. • It is valid as long as there is no evidence to dispute it. • EX. Cell Theory and Theory of Continental Drift

  4. Law • Generalizes a body of observations • Laws explain things, but they do not describe them • EX. Law of Gravity

  5. First Life FormsRole of RNA • Amino acids linked to make a chain that could make shapes like ribozymes (early ribosome) which could replicate itself

  6. First Life Forms - The First Cells • Prokaryotes before eukaryotes • 3 major trends all interrelated: • Anaerobic  Aerobic • Heterotrophic  Autotrophic • Chemosynthetic  Photosynthetic

  7. First Life Forms The First Eukaryotes • Endosymbiosis Theory • Mitochondria and chloroplasts are thought to be prokaryotic cells that were engulfed by a bigger cell • Supporting Evidence: • Both organelles contain their own DNA • DNA is circular (like other prokaryotes) • Can replicate on their own.

  8. Put these in the order in which they are thought to have originated on Earth • Anaerobic heterotrophic prokaryotes • Aerobic eukaryotes • Chemosynthetic prokaryotes • Photosynthetic prokaryotes Answer: 1, 3, 4, 2

  9. Sequence of First Cells Anaerobic Heterotrophic Prokaryotes Chemosynthetic Prokaryotes Photosynthetic Prokaryotes Endosymbiosis Occurs Here! Aerobic Eukaryotes Photosynthetic Eukaryotes

  10. Discovery Education-How Life Formed on Earth

  11. Class work • Read Pages 287-290 • Answer Questions 1-5 on page 290 • Write out questions or embed in answer. • Draw and label Endosymbiosis on page 290

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