性选择与 obligatory sex 的进化 。（注：这里“obligatory sex”不太明确准确含义，可能是“强制性性行为”等，需结合更多上下文确定准确译法）
Sexual selection and the evolution of obligatory sex.
作者信息
Hadany Lilach, Beker Tuvik
机构信息
Department of Biological Sciences, University of Iowa, Iowa City, Iowa 52242, USA.
出版信息
BMC Evol Biol. 2007 Dec 20;7:245. doi: 10.1186/1471-2148-7-245.
BACKGROUND
Among the long-standing conundrums of evolutionary theory, obligatory sex is one of the hardest. Current theory suggests multiple factors that might explain the benefits of sex when compared with complete asexuality, but no satisfactory explanation for the prevalence of obligatory sex in the face of facultative sexual reproduction.
RESULTS AND CONCLUSION
We show that when sexual selection is present obligatory sex can evolve and be maintained even against facultative sex, under common scenarios of deleterious mutations and environmental changes.
背景
在进化理论长期存在的难题中， obligatory sex是最难的难题之一。当前理论提出了多个因素，这些因素或许能解释与完全无性繁殖相比，有性繁殖的益处，但对于面对兼性有性生殖时 obligatory sex的普遍存在，却没有令人满意的解释。
结果与结论
我们表明，当存在性选择时，在有害突变和环境变化的常见情况下，即使与兼性有性生殖相对抗， obligatory sex也能够进化并得以维持。
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