A variation of a gene can influence people's social behavior.

基因的变异会影响人们的社会行为。

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In this case, the variation happens inside a gene for one of the receptor molecules that nicotine attaches itself to when it produces its buzz.

在这一情况下，编码一种受体分子基因的内部发生了变异——当这一受体发出信号时，尼古丁就与之结合。

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The scientists were able to replicate the gene variation in a strain of mice and found that the mice needed less sleep than usual, too.

科学家能够在一种老鼠的身上复制这一基因变异，结果发现，这种老鼠需要的睡眠时间也比平常少了。

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The McGill researchers found the families shared a variation of the Parkin gene and a neighbouring gene called PACRG which are both found on chromosome 6.

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But, by coincidence, he then discovered a group of scientists working on a mouse called Peromyscus that possesses the same less active variation of the MC1R gene as mammoths did.

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One example of this is variation in LCT, a gene involved in the metabolism of lactose, a sugar found in milk.

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