Question

Explain the Endosymbiont Theory

Answer 1

Endosymbiotic theory was proposed by the Russian scientist Konstantin Mereschkowsk in 1905 and 1910 and this microbiological evidences are provided by the Lynn Margulis in 1967. This story suggest the eukaryotic organelle such as mitochondria and chloroplast are Prokaryotes or Archea. With symbiotic relationship they started evolving in eukaryotic cells. There are several molecular evidences has been suggested that these organelles having evolve from the microorganism. Over the period of time they have reduced their genome size. Mitochondria, Plastids and Cholorpalst are representing free living organism become endosymbiont abour 1.5 million year ago.

Presence of own membrane is one and its resemblance with proakayotes suggest their prokaryotic origin. Apart from presence of prokaryotic ribosome, their high GC contain DNA, reduce DNA, prokaytic signature sequence, independent replication machinery, some protein synthesis machinery are best supporting and reliable evidences that suggest that these endosymbiont are prokaryotic origin.