1.The most likely explanation, something called parthenogenesis.

最可能的解释是一种称孤雌的东西。

2.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。

3.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。

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

科学家们认，孤雌有时候在进化上更有利，配可以成一种负担。

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

科学家们也发现，孤雌会在某些野蛇类种群中发。

6.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。

7.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。

8.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，而另外一些则既可以进行有性繁，也能进行孤雌。

9.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。

10.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，豌豆蚜可以孤雌，让种群数量在有利环境中迅速膨胀。

11.Scientists already knew that birds are capable of parthenogenesis, and now they've learned that crocs are also on board.

科学家早已知道鸟类具有孤雌的能力，现在他们又发现鳄鱼也具有这种能力。机翻

12.Mayflies can default to parthenogenesis, which is quite handy because some females live for less than 5 minutes.

蜉蝣可以默认进行孤雌，这非常方便， 有些雌性寿命不到 5 分钟。机翻

13.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。机翻

14.Still, parthenogenesis plays an important role when population numbers need to grow fast in a short time.

尽管如此，当种群数量需要在短时间内快速增长时，孤雌仍然起着重要作用。机翻

15.Parthenogenesis is a type of asexual reproduction where an embryo develops without previous fertilization.

孤雌是一种无性，其中胚胎无需先前受精即可发育。机翻

16.For parthenogenesis to happen, a chain of cellular events has to unfold.

了实现单性，必须发一系列细胞事件。机翻

17.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可以进行一种无性繁，即“孤雌”，在希腊语中是“处女起源”的意思。

18.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“处女育”——两者都不需要精子。机翻

19.Many cases of parthenogenesis have been discovered in geckos, snakes and lizards that live in dry and harsh climates, such as high altitudes.

在活在高海拔等干燥恶劣气候条件下的壁虎、蛇和蜥蜴中发现了许多孤雌的例子。机翻

20.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可以转孤雌，这非常方便，它们在死亡前只有一天左右的时间进行繁。