The most likely explanation, something called parthenogenesis.

最可能的解释是一种称为孤雌生殖的东西。

For this sort of mutagenic work, however, parthenogenesis is an advantage.

然而，对于这种突变工作来说，单性生殖是一种优势。

It's a product of parthenogenesis which means it was born from an unfertilized egg.

这种繁殖叫孤雌生殖这就是说它由没有受过精的卵孵化而来。

Scientists also confirmed that parthenogenesis was taking place in some wild snake populations.

科学家们也发现，孤雌生殖还会在某些野生蛇类种群中发生。

In parthenogenesis, an embryo develops from an unfertilized egg cell that doubles its own chromosome count.

在孤雌生殖中，胚胎由未受精的卵细胞在染色体数目翻倍后发育而来。

In fact, some animals only ever undergo parthenogenesis, while others can reproduce both sexually and parthenogenetically.

实际上，有些动物只进行孤雌生殖，而另外一些则既可以进行有性繁殖，也能进行孤雌生殖。

Scientists think parthenogenesis could be evolutionarily beneficial in some contexts because, well, sex can be a drag.

科学家们认为，孤雌生殖有时候在进化上更有利，因为交配可以成为一种负担。

But some aphids, katydids, lizards, geckos, and snakes only ever reproduce via parthenogenesis.

而有些蚜虫、蝈蝈、蜥蜴、壁虎、蛇等只进行孤雌生殖。

Members of Brachionus plicatilis are not as sex-starved as that, but they still reproduce for the most part by parthenogenesis.

褶皱臂尾虫的成员并没有那么地“性饥渴”，但它们仍多半通过单性生殖进行繁殖。

Even when there are males around, females may still use parthenogenesis.

即使周围有雄性，雌性仍可能采用孤雌生殖。