The DNA in Chloroplasts and Mitochondria of Eukaryotic Cells Is

Question

The DNA in chloroplasts and mitochondria of eukaryotic cells is derived from Bacteria.

Accepted Answer

The endosymbiotic theory suggests that chloroplasts and mitochondria were once free-living bacteria that were engulfed by early eukaryotic cells. As a result of this symbiotic relationship, the bacterial DNA within these organelles was retained and over time became integrated into the eukaryotic genome.