In general, they are considered to have originated from cyanobacteria
through endosymbiosis.
Other eukaryotic organelles may have also evolved
through endosymbiosis; it has been proposed that cilia, flagella, centrioles, and microtubules may have originated from a symbiosis between a Spirochaete bacterium and an early eukaryotic cell, but this is not yet broadly accepted among biologists.
First, some microbes developed a nucleus using cellular membranes to contain their DNA («eukaryotes»), perhaps
through endosymbiosis.
Not exact matches
This
endosymbiosis, or symbiotic merging of two cells, enabled the evolution of a highly stable and successful organisms with the capacity to use energy from sunlight
through photosynthesis.
Instead, some eukaryotes have obtained them from others
through secondary
endosymbiosis or ingestion.