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Download 14-3: Origin of Heredity
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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. • EX. Cell Theory and Theory of Continental Drift Law • Generalizes a body of observations • Laws explain things, but they do not describe them • EX. Law of Gravity First Life Forms Role of RNA • Amino acids linked to make a chain that could make shapes like ribozymes (early ribosome) which could replicate itself First Life Forms - The First Cells • Prokaryotes before eukaryotes • 3 major trends all interrelated: • Anaerobic Aerobic • Heterotrophic Autotrophic • Chemosynthetic Photosynthetic 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. • Put these in the order in which they are thought to have originated on Earth 1. 2. 3. 4. Anaerobic heterotrophic prokaryotes Aerobic eukaryotes Chemosynthetic prokaryotes Photosynthetic prokaryotes Answer: 1, 3, 4, 2 Sequence of First Cells Anaerobic Heterotrophic Prokaryotes Chemosynthetic Prokaryotes Photosynthetic Prokaryotes Endosymbiosis Occurs Here! Aerobic Eukaryotes Photosynthetic Eukaryotes Discovery Education-How Life Formed on Earth 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
