https://depot.ceon.pl/bitstream/handle/123456789/3286/Endosymbiotic%20Theory.pdf?sequence=1
Endosymbiotic gene replacement There are two kinds of such replacement: one is when a host gene present in the nucleus, takes over the function of an endosymbiont gene, resulting in loss of the latter. The second is when a host nuclear gene is replaced by an endosymbiont gene transferred to the host nucleus. In the first case, this process generally is accompanied by duplication of a host nuclear gene, followed by one copy is acquiring a proper endosymbiont/organelle-targeting signal.
Endosymbiotic gene replacement There are two kinds of such replacement: one is when a host gene present in the nucleus, takes over the function of an endosymbiont gene, resulting in loss of the latter. The second is when a host nuclear gene is replaced by an endosymbiont gene transferred to the host nucleus. In the first case, this process generally is accompanied by duplication of a host nuclear gene, followed by one copy is acquiring a proper endosymbiont/organelle-targeting signal.