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Endosymbiotic Theory

Endosymbiotic Theory. Endosymbiosis. Symbiosis , which means "living together" is an ecological interaction in which two or more species live in or on each other in close contact. Thus, endosymbiosis is when an organism actually lives within another organism. The Endosymbiotic Theory.

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Endosymbiotic Theory

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  1. Endosymbiotic Theory

  2. Endosymbiosis • Symbiosis, which means "living together" is an ecological interaction in which two or more species live in or on each other in close contact. Thus, endosymbiosis is when an organism actually lives within another organism.

  3. The Endosymbiotic Theory • The endosymbiotic theory is the idea that a long time ago, prokaryotic cells engulfed other prokaryotic cells by endocytosis. This resulted in the first eukaryotic cells. • First proposed by Lynn Margulis • Explains the origin of eukaryotic cells • Explains the origin of certain membrane-bound organelles

  4. What Exactly Happened? Chloroplast Plants and plant-like protists Ancient Prokaryotes Heterotrophic bacteria Photosynthetic bacteria Nuclear envelope evolving Mitochondrion Primitive Autotrophic (Photosynthetic) Eukaryote Animals, fungi, and animal-like protists Ancient Heterotrophic Prokaryote Primitive Heterotrophic Eukaryote

  5. Evidence in support of the endosymbiotic theory: • Similarities between mitochondria, chloroplasts, & prokaryotes: • Circular DNA • Ribosomes • Binary fission

  6. Explain theEndosymbiotic Theory. What does “symbiosis” mean? Based on this theory, how did chloroplasts and mitochondria arise? Questions

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