我们被告知，HIV的感染率在这一群体中居然是加倍的。
The HIV infection rate in this group has doubled, we are told.
另一个大谜团是这些蜥蜴到底是如何分解最初加倍的染色体的呢？
Another big unknown is precisely how the lizards end up with double the amount of chromosomes in the first place.
这种植物种群数量的“大爆炸”是在古代植物染色体组加倍时发生的。染色体组加倍给植物提供了大量具有新功能的基因，这些新基因又形成了新特性。
These "big bangs" in plant evolution occurred when the genomes of ancient plants duplicated, providing vast Numbers of new genes that could take on new functions and lead to new traits.
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