如果CO----1.表示序列处于中 性选择压力(neutral selection):o>1。代表序列处 于正选择压力(positive selection);若to<l,则序 列处于纯化选择压力(purifying selection)。
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许多味觉和嗅觉基因显示出选择性压力的迹象,也许反应了当人们的生活从流动到稳定时食物上发生的变化。
Many genes for taste and smell show signs of selective pressure, perhaps reflecting the change in foodstuffs as people moved from nomadic to sedentary existence.
这就导致选择性的压力,当一个男人必须相当严肃的对待他试图接近的异性。
This would lead to a selective pressure on men to take the task of propositioning very seriously indeed.
植食动物强大压力的一些事例可以帮助我们对选择过程的简略性有所了解。
Some examples of heavy herbivore pressure may help appreciation of the possible brevity of the selection process.
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