According to the endosymbiotic theory, some eukaryotic cell organelles, like mitochondria and plastids, descended from prokaryotes that were free to move around.
The theory of endosymbiosis. claims that once free-living prokaryotes, such chloroplasts and mitochondria, gradually lived symbiotically within bigger cells to become contemporary eukaryotes.
The endosymbiotic idea dates back more than a century.
It contends that the organelles evolved from prokaryotes through (endo)symbiosis, which accounts for how chloroplasts and mitochondria resemble free-living prokaryotes.
These contain the nucleus and mitochondrion of the primary ancestral eukaryote as well as the nucleus, mitochondrion, and chloroplast of the secondary endosymbiont.
Since the secondary mitochondrion has never been discovered, many genes from the subordinate genomes have been lost to evolution.
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