在最近的几年，生物学家已经能够扫描整个人类基因组寻找正在进行选择的基因的识别特征。
In the last few years, biologists have been able to scan the whole human genome for the signatures of genes undergoing selection.
但是，强选择时——正如在大规模种群中——从一开始匆匆建成的这一复杂性更高的基因组的随机变化就受到阻碍。
But when selection is strong - as in large populations - it blocks the random genomic changes that throw up this greater complexity in the first place.
选择如何在基因组留下指纹图谱？
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