Parthenogenesis, meanwhile, requires only one parent.

而孤雌生只需要一位父母。

The most likely explanation, something called parthenogenesis.

最可能解释是一种称为孤雌生西。

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

这种繁叫孤雌生这就是说它由没有受过精卵孵化而来。

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，而另外一些则既可以进行有性繁，也能进行孤雌生。

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

们认为，孤雌生有时候在进化上更有利，因为交配可以成为一种负担。

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

在孤雌生中，胚胎由未受精卵细胞在染色体数目翻倍后发育而来。

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

们也发现，孤雌生还会在某些野生蛇类种群中发生。

Bdelloid rotifers, meanwhile, have been reproducing parthenogenetically for 60 million years.

与此同时，蛭形轮虫已经孤雌生了近 6000 万年。

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。

Parthenogenesis is best confirmed with DNA analysis, and dinosaur DNA doesn't exist in fossils.

孤雌生最好证实方式是使用 DNA 分析，而恐龙 DNA 并不存在于化石中。

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

在夏季食物充足时候，豌豆蚜可以孤雌生，让种群数量在有利环境中迅速膨胀。

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

早已知道鸟类具有孤雌生能力，现在他们又发现鳄鱼也具有这种能力。

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。

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生，这非常方便， 因为有些雌性寿命不到 5 分钟。

Parthenogenesis is characterized by a lack of genetic diversity, which can lead to harmful mutations and diseases.

孤雌生特点是缺乏遗传多样性，这可能导致有害突变和疾病。

In a parthenogenetic population, on the other hand, individuals can only reproduce using their own genetic material.

另一方面，在孤雌生群体中，个体只能利用自身遗传物质进行繁。

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

孤雌生是一种无性生，其中胚胎无需先前受精即可发育。

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，孤雌生仍然起着重要作用。

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生——有时称为“处女生育”——两者都不需要精子。

But scientists have observed an accumulation of harmful mutations in parthenogenetic stick insects that are absent in their sexual relatives.

但们已经发现，一种孤雌生粘虫在缺乏性伴侣时积累起有害变异。