The origin of mitosis and the nuclear envelope were the pivotal processes in the evolutionary origin of the nucleus; they probably occurred in a wall‐less mutant bacterium that evolved a cytoskeleton and phagocytosis about 1500 million years ago. Principles of intracellular coevolution clarify their origin, as well as that of nucleosomes, spliceosomes, and the evolution of genome size.
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Thomas Cavalier‐Smith (1988) studied this question.
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