The most likely explanation, something called parthenogenesis.

最可能解释是一种称为孤雌殖东西。

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.

这种繁殖叫孤雌殖这就是说它由没有受过孵化而来。

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.

孤雌殖中，胚胎由未受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殖，而另外一些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，一些具有性物种可以进行一种无性繁殖，即“孤雌殖”，希腊语中是“处女起源”意思。

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

夏季食物充足时候，豌豆蚜可以孤雌殖，让种群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部分和种子，它们是风或蜜蜂等事物帮助下授粉。