And a gene called KCNJ6, located on chromosome 21, is known to make GIRKs.
而叫做KCNJ6的基因，被发现在染色体21上，已知会产生GIRKs。
Scientists have long suspected that such genetic benefits might accrue from having an extra chromosome 21.
科学家更深入地推测，这些基因上的益处也许能在那条额外的21号染色体上获得增加。
For example, if the haploid number is 7, the euploid number would be 7, 14, 21, 28, etc, and there would be equal Numbers of each different chromosome.
例如，一种生物单倍体染色体数目是7，整倍数将是7、14、21、28等数目，并且每条不同的染色体有相等的数目。
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