当科学家们将基因与特定疾病联系在一起的时候，往往不知道这些基因起什么作用——这些基因能产生何种蛋白质或控制哪个过程——还有什么因素会促使它们开或闭，激活或睡眠。
When scientists connect a gene to a disease, they often don't know what that gene does-the protein it makes or the process it regulates-or what factors turn it on or off, up or down.
今日体重几乎不起什么作用，因为大部分差异是由基因引起的，因此又一个进化的因素消失了。
Today it makes almost no difference. Since much of the variation is due to genes one more agent of evolution has gone.
今日体重几乎不起什么作用，因为大部分差异是由基因引起的，因此又一个进化的因素消失了。
Today it makes almost no difference. Since much of the variation is due to genes one more agent of evolution has gone.
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