What's more, the work suggests that some duplicate genes play a key role in the evolution of new traits and in speciation.

并且，研究工作表明，一些复制的基因在新的特征进化和物种形成过程中起到非常重要的作用。

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So Dennis and her colleagues examined the duplicate genes in more than 150 people and found that the copy made 3.4 million years ago is missing in some people.

为此，丹尼斯和同事检测了超过150人的基因，发现其中一些人不具有340万年前产生的那个SRGAP2基因副本；

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Also, such stem cells may have duplicate copies of some mutant genes that have been linked to cancer and abnormal tissue growth.

因此，一些干细胞可能带有与癌症或者组织的异常生长相关的突变基因的双份拷贝。

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Because women have their sex genes written in duplicate, they always have a second chance of a correct version.

ECONOMIST: Genetics