Our current understanding of the origin of eukaryotic organelles such as mitochondria is that they

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The endosymbiotic theory suggests that eukaryotic organelles such as mitochondria were once free-living prokaryotes that were taken up by another cell and began to live symbiotically, eventually becoming integrated into the host cell's genome. This theory is strongly supported by evidence such as the similarity between the inner membranes of mitochondria and the membranes of prokaryotes, as well as the fact that mitochondria have their own circular DNA similar to that of prokaryotes.

Our Current Understanding of the Origin of Eukaryotic Organelles Such