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原帖由 荼靡花开 于 2009-10-27 14:31 发表 
男女有别，好大的一个话题，一下把狭义的争论广义化了
这是事实，不用否认，问题是男女有别这个合理的大帽子容易被用作解释一些已经不太合理的标准
过去的“一夫多妻”可以是因为男女有别，缠小脚可以因为男女 ...
why does nature tolerate males? They produce no offspring of their own, one consequence of which is that populations of plants and animals capable of self-fertilisation, or “selfing”, grow at twice the rate of populations that depend on sexual reproduction.
Yet, there must be evolutionary advantage in sex with a partner. Scientists at Oregon university argue in Nature magazine that their research with roundworms – which can self-fertilise or reproduce sexually – shows selfing populations are more susceptible to harmful genetic mutations and slow to adapt to swiftly changing environmental conditions. “Selfing populations are more likely to become extinct,” said Levi Morran, lead author.
Yet, selfing populations thrive and survive. One explanation, based on a discovery in rice plants which Susan Wessler of the University of Georgia described as “brand new and really stunning”, is that movable genetic material called transposable elements insert themselves at various points in the chromosomes, providing a source of genetic variation in response to changing conditions. |
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狗仔卡
发表于 2009-10-27 14:57
