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Endosymbiotic Theory “Everything you need to know” Endosymbiotic Theory •Prokarytic cells developed into Eukaryotic Cells. •They evolved by developing a symbiotic relationship with a primative aerobic bacteria and a cyanobacteria • How? Endocytosis or engulfing •Result? Evolution of eukaryotic cells The Endosymbiotic Theory proposes that: •Aerobic Bacteria became Mitochondria •Cyanobacteria became Chloroplast Endosymbiont Theory Support for this Theory: • Same size and structure as bacteria • Have their own DNA that is different from the DNA of the nucleus • Divide similarly- binary fission Endosymbiont Theory • Chloroplasts and Mitochondria are descendants of once free-living prokaryotes that were engulfed by larger cells… establishing a symbiotic (mutually beneficial) relationship. The End