The most likely explanation, something called parthenogenesis.

最可能的解释是一称为孤雌殖的东西。

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

然而，对于这突变工作来说，单性殖是一优势。

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

这繁殖叫孤雌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，孤雌殖还会野蛇中发。

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

孤雌殖中，胚胎由未受精的卵细胞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，有动物只进行孤雌殖，而另外一则既可以进行有性繁殖，也能进行孤雌殖。

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

科学家们认为，孤雌殖有时候进化上更有利，因为交配可以成为一负担。

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

而有蚜虫、蝈蝈、蜥蜴、壁虎、蛇等只进行孤雌殖。

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殖进行繁殖。

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

不过，一具有性细胞的物可以进行一无性繁殖，即“孤雌殖”，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.

夏季食物充足的时候，豌豆蚜可以孤雌殖，让数量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殖——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.

蜉蝣没有雄性存的条件下可以转为孤雌殖，这非常方便，因为它们死亡前只有一天左右的时间进行繁殖。

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殖的过程进行无性繁殖，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子，它们是风或蜜蜂等事物的帮助下授粉的。