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- W2127226145 endingPage "728" @default.
- W2127226145 startingPage "707" @default.
- W2127226145 abstract "Sex is generally thought of as meiosis, conjugation, and syngamy, with the primary function of sex believed to be genetic mixing. However, conjugation does not occur with complete automixis, whereas syngamy does not occur with restitutional automixis. Self sex in the forms of automixis and autogamy does not include genetic mixing. Yet sex, including self sex, is necessary for most eukaryotic lineages. What is the purpose of sex without genetic mixing? Obligate self sex is not an evolutionary dead end, but holds the key to understanding the evolutionary origin, function, maintenance, and ubiquity of sex. We extend the rejuvenescence hypothesis that sex provides a necessary developmental reset for multicellular eukaryotes and even many unicellular eukaryotes. Sex reduces additive genetic variance of epigenetic signals, especially cytosine methylation, and of ploidy levels. Furthermore, we argue that syngamy is a modified form of meiosis that maintains ploidy and resets epigenetic signals. Epigenetic resetting is consistent with sex being induced by starvation or desiccation. Diminution of additive genetic variance is consistent with the origin and maintenance of an adaptive trait, sex, that has been present for approximately two billion years. © 2009 The Linnean Society of London, Biological Journal of the Linnean Society, 2009, 98, 707‐728." @default.
- W2127226145 created "2016-06-24" @default.
- W2127226145 creator A5054671406 @default.
- W2127226145 creator A5072547646 @default.
- W2127226145 date "2009-11-23" @default.
- W2127226145 modified "2023-10-10" @default.
- W2127226145 title "Origin and maintenance of sex: the evolutionary joys of self sex" @default.
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