"It seemed like the perfect chance for natural selection to act on a population," said Dr. Ilardo.

“这似乎是自然选择在一个群体中发挥作用的完美机会。”伊拉尔多博士说。

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That has provoked a debate about whether the phenomenon is an aberration, or whether natural selection favours it, at least when it is rare in a population.

这激起了一场争论，到底这种现象是误差，或是自然选择偏爱的结果(至少当它在群体中只占有稀少比例时)。

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Based on the selection, the city population and ranking are fetched from the database and displayed in a Relational Record List.

基于所选择的城市，将从数据库中获取城市人口和等级，并显示在一个关联记录列表中。

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Selection can shift a population from life in the trees to life on the ground by tiny steps but only if the right kind of variation is available.

ECONOMIST: A master of evolution takes a last long look at Darwin

Selection on an arboreal ape population will be impotent if variations which improve their terrestrial prospects are sparse.

ECONOMIST: A master of evolution takes a last long look at Darwin

Though the genes in question have yet to be identified, this result suggests they are too abundant to be there by chance in other words they are being kept in the population by natural selection because psychopathic behaviour confers a selective advantage.

ECONOMIST: Evidence that psychopaths are born, not made