Semi autonomous organelles are organelles which possess their own genetic material or Deoxyribonucleic acid (DNA) and Ribosomes of 50 S, 70 S and 80 S. In eukaryotic cells they are capable for functioning for synthesising the PROTEINS for energy release and functioning of the organelles. Mitochondria and chloroplasts are called semi autonomous organelles having their own DNA and Ribosomes which are originating presently from consumption or totally invaded PROKARYOTIC organisms, as if which, the parts of the invaded cells became a "semi autonomous organelle".

Theory of symbiogenesis or commonly known endosymbiotic theory recalls to the original positionary locations arising from a prokaryotic cell, this theory was theorised and proposed by Konstantin Sergeevich Mereschkowski (Born 1855 at Imperial Russia or the Russian Empire), putting up a notice of cell organelles being the ancestors of bacterium making others to think and at the same time coming into eminence through popularisation with the help of Lynn PETRA Alexander (Born 1938 at United States of America, Chicago until the demise at 2011) she made this CLEAR by handling endosymbiotic theory and PROVED the containment of nucleus, ribosome and DNA as their own possession from a nuclear DNA.