线粒体dna是核外唯一的遗传物质，较核d NA更易发生突变。

Mitochondrial DNA was the only genetic material outside of nuclear.

youdao

线粒体dna是核外唯一的遗传物质，较核d NA更易发生突变。

Mitochondrial DNA was the only genetic material outside of nuclear.

youdao