Mitochondria and chloroplasts are thought to have arisen by endosymbiosis. What clues as to their origin do we see from their genomes? - Cuntorio

There Genomes, like prokaryotic genomes, are circular and usually very efficient, containing no repetitive sequences or introns. The ribosomes used in translation are closer to those in the bacterial protein synthesis system than in the eukaryotic one; e.g., 12S and 16S rRNAs are used. Other clues include the number of membranes surrounding the organelle; some organelles have more than one