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Their mitochondria , unlike those of the ashkenazim , give no sign of a recent bottleneck . Their dna show instead how porous the boundaries of faith may be .

与阿什肯纳兹犹太人不同，瑟法底犹太人的线粒体dna没有在近代集中的迹象，这亦表明他们的信仰可能来来回回改变了多次。

Researchers argue that it 's highly unlikely that mutated genes responsible for these illness could have reached such high levels in ashkenazim if they were not connected to cognitive performance .

研究者认为，如果引起这些疾病的变异基因与认知能力没有关系的话，那么这些变异的基因十有八九不会在犹太人身上达到如此之高的程度。

His argument is that the unusual history of the ashkenazim has subjected them to unique evolutionary pressures that have resulted in this paradoxical state of affairs .

他认为正是异常的历史环境强加给了德系犹太人独有的进化压力，才导致了这些看似奇怪的现象。