<P> Symbiogenesis, or endosymbiotic theory, is an evolutionary theory of the origin of eukaryotic cells from prokaryotic organisms, first articulated in 1905 and 1910 by the Russian botanist Konstantin Mereschkowski, and advanced and substantiated with microbiological evidence by Lynn Margulis in 1967 . It holds that the organelles distinguishing eukaryote cells evolved through symbiosis of individual single - celled prokaryotic (bacteria and archaea). </P> <P> The theory holds that mitochondria, plastids such as chloroplasts, and possibly other organelles of eukaryotic cells represent formerly free - living prokaryotes taken one inside the other in endosymbiosis . In more detail, mitochondria appear to be related to Rickettsiales proteobacteria, and chloroplasts to nitrogen - fixing filamentous cyanobacteria . </P>

Who came up with the theory of endosymbiosis