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What are the key events in the evolution of cellular life?

What are the key events in the evolution of cellular life?. Chapter 25 AP Big Idea #1. Event Cartoons. Using Chapter 25 in your textbook, consider what event each cartoon card represents and lay the card in correct sequence on your table.

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What are the key events in the evolution of cellular life?

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  1. What are the key events in the evolution of cellular life? Chapter 25 AP Big Idea #1

  2. Event Cartoons • Using Chapter 25 in your textbook, consider what event each cartoon card represents and lay the card in correct sequence on your table. • Notetaking tip: Set up a table to describe the event, list and define key terms, and discuss evidence to support the event

  3. Before there were cells… • Big Bang Theory/Formation of Earth • Conditions on Early Earth • Oparin – Reducing Atmosphere • Evidence: Urey and Miller produce amino acids out of “primordial soup”

  4. Formation of Protocells • http://www.youtube.com/watch?v=GOTke2eJ5K8 • 4 steps: Synthesis, polymerization, aggregation, replication • Evidence – formation of coacervates

  5. Characteristics of Early Cells • Single celled, Prokaryotic, Heterotrophic • Molecular Evidence: Glycolysis • Shared Ancestral Trait – conservation of enzymes • Geological Evidence:CO2 concentration in rock layers

  6. Evolution of photosynthesis leads to aerobic respiration Availability of CO2 provided reactants for photosynthesis Availability of 02 provided reactants for more efficient aerobic respiration Evidence: Iron Oxide • Evidence: Stromatolites

  7. Why is the prevailing hypothesis that photosynthesis evolved once? • Look at the principle of parsimony within the protist kingdom.

  8. Once there was oxygen… • Eukaryotic cells formed… • Multicellular life evolved… • Sexual reproduction evolved… • “Cambrian Explosion” of multicellular life in the last 1000 million years!

  9. 3 Main Eras in Multicellular Time • Paleozoic: Diversity in the ocean (500-250 mya) • Mesozoic: Diversity on Land: Large reptiles; mammals small (250-65 mya) • Cenozoic: Age of flowering plants and mammals (65 mya – present) • Each era ended with a Mass Extinction

  10. Endosymbiosis—Describe the theory in words

  11. A theory needs evidence… • mtDNA and cpDNA • Ribosomes and protein synthesis • Size/Structure • Double membranes • Binary Fission

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