有些科学家提出，我们从母体遗传来的线粒体DNA很少发生变异，说明瓶颈发生在不久以前祖先走出非洲的时候。

Some researchers proposed that the lack of variation in our maternally inherited mitochondrial DNA suggested these bottlenecks took place as our ancestors spread out of Africa relatively recently.

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大量的研究表明，细胞质雄性不育与线粒体dna的变异有密切的联系。

The massive research indicate that cytoplasmic male sterility has the close relation with the mitochondrial DNA variation.

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