• 1. single gene mutation: 单基因突变
• 2. a single gene mutation: 单基因突变

• 1.Fortunately, a single gene mutation rarely causes things to go horribly wrong.
  幸运的是，一个单一的基因突变很少导致严重错误的东西。
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• 2.Although a recent study found that a single gene mutation heightened the risk of obesity by up to 67 percent, genetics cannot explain the skyrocketing obesity trend.
  尽管最近的研究发现单基因突变使肥胖的风险增加高达67%，但是遗传不能解释飞涨的肥胖趋势。
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• 3.The objective is to assess the roles of single stranded conformation polymorphism (SSCP) and heteroduplex polymorphism (HET) in screening gene mutation.
  目的是评价异源双链分析（HET）和单链构象多态性分析（SSCP）在基因突变检测中的作用。
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