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Symbiogenesis

Endosymbiotic theory, is an evolutionary theory which explains the origin of eukaryotic cells from prokaryotes.

Key organelles of eukaryotes originated as symbiosis between separate single-celled organisms.

According to this theory, mitochondria and chloroplasts are descendants of formerly free-living bacteria.

These bacteria were taken inside another cell as an endosymbiont, and over time lost their ability to live on their own, but gained a stable protective environment.

Would have occured around 1.5 billion years ago.

Serial_endosymbiosis.svg

http://en.wikipedia.org/wiki/Symbiogenesis

Uprooting the Tree of Life

Scientific American, Feb 2000 W. Ford Doolittle

Scientific American,
Feb 2000 W. Ford Doolittle

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