Question

Research suggests that mitochondria and chloroplasts are modern-day descendants of ancient prokaryotes that were engulfed by ancestral eukaryotes. DNA is present in both of these organelles, which represents the only location for DNA in a eukaryotic cell outside of the nucleus. Briefly explain how this DNA evidence strongly supports this theory of endosymbiosis.

Answer 1

Answer:

Explanation:

Mitochondria and Chloroplast contain some  Ribosomes which are different from the cytoplasmic ribosomes,These were measured to be 80s,while the Mitochondria and Chloroplasts are 70s.

Furthermore smaller circular DNA were found in theses two organelles,(which are the first DNA outside nucleus).These DNA types are the exact forms found in bacteria.

Thus, it was concluded that if these organelles could contained these genetic materials,they must  be bacterial.Therefore chloroplast and mitochondria were  ancient bacterial which  now live  in a mutual exclusive relationships in the larger cells of Eukaryotas(plant and animals).This is the basis of Endosymbiont theory.

That is these organelles  live inside(Endo) new host in symbiosis or  beneficial association with one another (symbiont).