The answer is a germline mutation.
The germline mutation is heritable variation in the lineage of <span>germ cells. Germ cells are cells that give rise to the gametes, so a mutation in germ cell will be seen in a sperm cell but not in a skin cell.</span>
The endosymbiotic hypothesis explains that how eukaryotic cells might have evolved chloroplasts and mitochondria within their cells.
The endosymbiotic hypothesis states that the eukaryotes have developed via a procedure whereby distinct kinds of free-living prokaryotes became assimilated within the bigger prokaryotic cells and ultimately evolved into chloroplasts, mitochondria, and various other organelles.
