1. Scientists have found a genetic mutation that appears to be the cause of Huntington's disease. 科学家们已经发现一个似乎是亨廷顿病病因的遗传突变。
2. If a copy of a gene is a bit different from the original, that's called a genetic mutation. 如果一个复制的基因与原来的有些许不同，那就叫做基因突变。
3. Furthermore, the single copy of a founder mutation often confers a survival advantage on carriers. 此外，创始者突变的单一拷贝通常赋予携带者生存优势。
4. Cattle raising people in East Africa and northern Europe have gained a mutation that helps them digest milk as adults. 东非和北欧的养牛人发生了一种突变，帮助他们像成年人一样消化牛奶。
5. Norwegian scientists have analysed samples from more than 70 patients with clinical illness and no further instances of this mutation have been detected. 挪威科学家对从70多名临床疾病患者身上采集的标本作了分析，未发现更多的此类变异情况。
