它们有时候会繁殖下一代，有时候则只是复制基因，直到时机成熟才将一大群子子孙孙打包送出去。
Sometimes they get in and get busy making babies. Other times they copy their chromosomes but hold off parceling them out to their army of offspring until the time is right.
当你有一个基因的两个复制品时，有利改变可能就会出现，使一个或两个复制基因能够出现新的功能，并保留老的功能。
When you have two copies of a gene, useful mutations can arise that allow one or both genes to explore new functions while preserving the old function.
当你有一个基因的两个复制品时，有利改变可能就会出现，使一个或两个复制基因能够出现新的功能，并保留老的功能。
When you have two copies of a gene, useful mutations can arise that allow one or both genes to explore new functions while preserving the old function.
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