Two eukaryotic organelles that are hypothesized to be the result of endosymbiosis are the and the two eukaryotic organelles that are hypothesized to be the result of endosymbiosis are the and the mitochondrion / chloroplast nucleus / golgi body endoplasmic reticulum / golgi body hydrogenosome / chloroplast

The answer is mitochondria /chloroplast. This is in animals and plants respectively. It is believed that the two organelles were once bacteria engulfed by larger cells probably in endocytosis. Over time, they developed mutual symbiosis since the two organelles became 'powerhouses ' for the cells while the bacteria were sheltered. The endosymbiotic theory is supported by the fact that these organelles have their own DNA.