According to the endosymbiosis theory mitochondria were engulfed by larger eukaryotic cells.
The photosynthetic bacteria were then swallowed by eukaryotic cells with mitochondria, which later developed into specialised chloroplast organelles. Both mitochondria and chloroplasts still have tiny genomes that resemble those of current prokaryotes in addition to having double membranes.
According to the dominant explanation, known as the endosymbiotic theory, eukaryotes developed when an ancient Archaean cell fused with an aerobic, ancient bacterial cell.
The mitochondria, which are present in the majority of eukaryotes, and the chloroplasts are the two main organelles of eukaryotic creatures that have emerged via endosymbiosis.
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