Evolutionary biologists call this phenomenon heterozygote advantage.

进化生物学家称这种现象为杂合子优势。

Again, my examples of heterozygote advantage offer a useful illustration.

同样，我的杂合子优势示例提供了一个有用的说明。

This phenomenon is called heterozygote advantage; and its unfortunate consequence is a high rate of sickle cell disease in people from those parts of the world.

该现象被称为杂合子优势；其伴随的不幸后果是这些地区有高比例的镰状细胞病患者。

But the unusual prevalence of the Tay-Sachs mutation in Ashkenazi populations may be another example of heterozygote advantage.

但德系人群中 Tay-Sachs 突变的异常流行可能是杂合子优势的另一个例子。

So heterozygote advantage can help explain why problematic versions of genes persist at high frequencies in certain populations.

因此杂合子优势可以帮助解释为什么有问题的基因版本在某些人群中以高频率持续存在。