Question

The theory of endosymbiosis describes the probable evolution of what type of cell?

Answer 1

Endosymbiosis possibly resulted in the evolution of eukaryotic cells.

Explanation:

Mitochondria and cholroplasts bear great similarites with proteobacteria.
Mitochondria can reproduce only through binary fission.This is the commonest form of reproduction in bacteria and archaea.

Mitochondria and chloroplasts have their own circular DNA,again a shared trait with bacteria.

Possibly mitochondria and chloroplasts were free living organisms akin to Rickettsiales proteobacteria and cyanobacteria respectively.

They entered into a symbiotic relationship with other free living cells and over time lost their ability to be independent.

https://en.wikipedia.org
/wiki/Transfer_of_mitochondrial_and_chloroplast_DNA_to_the_nucleus