Posted by Mengistu on Friday, March 1, 2013 at 2:11am.
The mitochondria evolved in eukaryotic cells from a symbiotic relationship with prokaryotic cells; prokaryotic cells do not have a mitochondria because in a sense, they are mitochondria. Prokaryotic cells divide by binary fission, which is similar to mitosis. However, prokaryotic cells do not have a nucleus and thus can not form spindle fibers, which are needed to undergo mitosis.
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