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  1. In the beginning: the initiation of meiosis.Wojciech P. Pawlowski, Moira J. Sheehan & Arnaud Ronceret - 2007 - Bioessays 29 (6):511-514.
    The most‐critical point of reproductive development in all sexually reproducing species is the transition from mitotic to meiotic cell cycle. Studies in unicellular fungi have indicated that the decision to enter meiosis must be made before the beginning of the premeiotic S phase. Recent data from the mouse1 suggest that this timing of meiosis initiation is a universal feature shared also by multicellular eukaryotes. In contrast, the signaling cascade that leads to meiosis initiation shows great diversity among species. BioEssays 29:511–514, (...)
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  • Did meiosis evolve before sex and the evolution of eukaryotic life cycles?Karl J. Niklas, Edward D. Cobb & Ulrich Kutschera - 2014 - Bioessays 36 (11):1091-1101.
    Biologists have long theorized about the evolution of life cycles, meiosis, and sexual reproduction. We revisit these topics and propose that the fundamental difference between life cycles is where and when multicellularity is expressed. We develop a scenario to explain the evolutionary transition from the life cycle of a unicellular organism to one in which multicellularity is expressed in either the haploid or diploid phase, or both. We propose further that meiosis might have evolved as a mechanism to correct for (...)
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  • Ancestral Eukaryotes Reproduced Asexually, Facilitated by Polyploidy: A Hypothesis.Sutherland K. Maciver - 2019 - Bioessays 41 (12):1900152.
    The notion that eukaryotes are ancestrally sexual has been gaining attention. This idea comes in part from the discovery of sets of “meiosis‐specific genes” in the genomes of protists. The existence of these genes has persuaded many that these organisms may be engaging in sex, even though this has gone undetected. The involvement of sex in protists is supported by the view that asexual reproduction results in the accumulation of mutations that would inevitably result in the decline and extinction of (...)
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  • The management of DNA double‐strand breaks in mitotic G2, and in mammalian meiosis viewed from a mitotic G2 perspective.Paul S. Burgoyne, Shantha K. Mahadevaiah & James M. A. Turner - 2007 - Bioessays 29 (10):974-986.
    DNA double‐strand breaks (DSBs) are extremely hazardous lesions for all DNA‐bearing organisms and the mechanisms of DSB repair are highly conserved. In the eukaryotic mitotic cell cycle, DSBs are often present following DNA replication while, in meiosis, hundreds of DSBs are generated as a prelude to the reshuffling of the maternally and paternally derived genomes. In both cases, the DSBs are repaired by a process called homologous recombinational repair (HRR), which utilises an intact DNA molecule as the repair template. Mitotic (...)
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  • Were eukaryotes made by sex?Michael Brandeis - 2021 - Bioessays 43 (6):2000256.
    I hypothesize that the appearance of sex facilitated the merging of the endosymbiont and host genomes during early eukaryote evolution. Eukaryotes were formed by symbiosis between a bacterium that entered an archaeon, eventually giving rise to mitochondria. This entry was followed by the gradual transfer of most bacterial endosymbiont genes into the archaeal host genome. I argue that the merging of the mitochondrial genes into the host genome was vital for the evolution of genuine eukaryotes. At the time this process (...)
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