1. Endosymbiosis

2. Endosymbiotic Theory
Prokaryotic cells developed into eukaryotic Cells.
They evolved by creating a symbiotic (beneficial) relationship with a primitive aerobic bacteria and a cyanobacteria
How: Endocytosis or engulfing (cell eating)
Result: Evolution of eukaryotic cells

3. The theory proposes that:
Aerobic Bacteria became mitochondria
Cyanobacteria became chloroplasts

4. Endosymbiotic 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

5. Endosymbiotic Theory
Chloroplasts and Mitochondria are descendants of once free-living prokaryotes that were engulfed by larger cells…establishing a symbiotic relationship.