endosymbiotic theory


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endosymbiotic theory

n.
A theory stating that the eukaryotes evolved through a process whereby different types of free-living prokaryotes became incorporated inside larger prokaryotic cells and eventually developed into mitochondria, chloroplasts, and possibly other organelles.
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Two theories, gene transfer theory (Shaw, 1993) and endosymbiotic theory (Liang, 1999), were employed for the explanation of these complicated natural phenomena.
However, ever since a seminal event in the far past--it's hypothesized in the Endosymbiotic Theory that one prokaryotic (non-nucleated, single cellular bacteria) organism engulfed another one and rather than just digesting it, began a productive co-association--there have actually been two (or more) distinct genome partitions in eukaryotic cells.
The late Lynn Margulis explains endosymbiotic theory and the evolutionary importance of symbiotic relationships between organisms from dissimilar phyla or kingdoms.