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The core meiotic machinery is largely universal in eukaryotes indicating that a substantial proportion of the meiotic machinery had already evolved in early eukaryotes [1]. Since there appear to be no close homologues to meiosis and the sexual cycle in either the bacterial or archaeal domains, it seems reasonable to propose that the origin of meiosis appears to be associated with the early origin of the eukaryotes themselves. Given the complexity and the level of integration of the intricate processes required to effectively maintain meiosis and a sexual cycle, it has been difficult to envisage how the full meiotic and sexual cycles could appear in the eukaryotic domain, without clear homologues in the prokaryotic domains of life. This is a particular challenge if all life descends directly from a Last Universal Common Ancestor (the LUCA hypothesis) and life evolves only according to the classical neo-Darwinian principles of incremental changes. It is not surprising then that the origin of sex, (and by extension the origin of meiosis), has been described as the queen of evolutionary problems [2].

Meiosis: Its Origin According to the Viral Eukaryogenesis Theory