The evolution of condition-dependent sex in the face of high costs
The evolution of condition-dependent sex in the face of high costs
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DOI：
10.1534/genetics.107.074203
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发表时间：
2007-07-01
期刊：
影响因子：
3.3
通讯作者：
Otto, Sarah P.
中科院分区：
文献类型：
--
作者：
Hadany, Lilach;Otto, Sarah P.
当身体状况不佳时，有性生殖的生物往往会更频繁地进行性行为。我们表明，这种依赖条件的性行为具有进化优势，即使在性行为需要高成本的情况下，也可以解释有性生殖的进化。具体来说，我们表明，等位基因促进低健身的个人更经常比高健身的个人在人群中传播。这样的等位基因更有可能从不良的遗传背景中分离出来，并进入良好的遗传背景，并倾向于保留下来。这种“抛弃”机制为兼性生殖的进化和维持提供了一个合理的模型。
Facultatively sexual organisms often engage in sex more often when in poor condition. We show that such condition-depen dent sex carries evolutionary advantages and can explain the evolution of sexual reproduction even when sex entails high costs. Specifically, we show that alleles promoting individuals of low fitness to have sex more often than individuals of high fitness spread through a population. Such alleles are more likely to segregate out of bad genetic backgrounds and onto good genetic backgrounds, where they tend to remain. This "abandon-ship" mechanism provides a plausible model for the evolution and maintenance of facultative sex.