the theory of endosymbiosis according to this theory explains how eukaryotic cells may have evolved from prokaryotic cells explain why mitochondria have their own DNA separate from nuclear DNA?

If Mitochondria and chloroplasts havestriking similarities to bacteria cells. They have their own DNA, which isseparate from the DNA found in the nucleus of the cell. And both organelles use their DNA to produce many proteins and enzymes required for their function.