genes that function in meiosis, including five genes that function only in meiosis. In addition, G. intestinalis was recently found to undergo a specialized, sex-like process involving meiosis gene homologs. This evidence, and other similar examples, suggest that a primitive form of meiosis, was present in the common ancestor of all eukaryotes, an ancestor that arose from an antecedent prokaryote.

From mitosis

Mitosis is the normal process in eukaryotes for cell division; duplicating chromosomes

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