The most likely explanation, something called parthenogenesis.

的解释是一种称为孤雌的东西。

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

然而，对于这种突变工作来说，单性是一种优势。

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

这种繁叫孤雌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，孤雌还会在某些野蛇类种群中发。

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

在孤雌中，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，而另外一些则既以进行有性繁，也进行孤雌。

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

科学家们认为，孤雌有时候在进化上更有利，因为交配以成为一种负担。

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。

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进行繁。

But some species that have sex cells can undergo a type of asexual reproduction called parthenogenesis — meaning " virgin origin" in Greek.

不过，一些具有性细胞的物种以进行一种无性繁，即“孤雌”，在希腊语中是“处女起源”的意思。

In the summer, when food is abundant, pea aphids can rely on parthenogenesis, allowing their population to explode under favorable conditions.

在夏季食物充足的时候，豌豆蚜以孤雌，让种群数量在有利环境中迅速膨胀。

But this wasn’t a case of cloning or parthenogenesis -- sometimes called " virgin birth" -- neither of which requires sperm.

但这不是克隆或孤雌——有时称为“处女育”——两者都不需要精子。

Mayflies can sometimes default to parthenogenesis if there are no males available, which is especially handy because they've only got a day or so to reproduce before dying.

蜉蝣在没有雄性存在的条件下以转为孤雌，这非常方便，因为它们在死亡前只有一天左右的时间进行繁。

Cultivated bananas reproduce asexually, through a process known as parthenogenesis, which literally means " virgin birth." Most plants have male and female flower-parts and seeds, that are pollinated with the help of things like the wind, or bees.

栽培香蕉通过称为孤雌的过程进行无性繁，字面意思是“处女育” 。 大多数植物都有雄性和雌性花的部分和种子，它们是在风或蜜蜂等事物的帮助下授粉的。