What's the difference between a gamete and a zygote?

生和受精卵的区别是什么？

Work is already under way to develop principles for editing reproductive cells.

编生的原则制定工作已经开始。

Each primordial follicle has a single immature sex cell called the primary oocyte at the core, and a layer of follicular cells surrounds this.

每一个始基卵泡中心都有一个未成熟的生，叫做初级卵母，被卵泡包裹。

" FYI this is probably the first human germ line editing, " Dr. Quake wrote.

“谨供参考：这可能是人类生的首次编，”写道。

Another, they're releasing reproductive cells called spores.

后来，它们又释放一种叫做孢子的生。

Like, when you're facing a life-or-death ordeal, you don't need to be digesting that cashew cluster in your intestines, or producing reproductive cells, or fighting off an infection.

如，当你面临生死攸关的考验时，你不需要消化肠道里的腰果，或者产生生，又或者抵抗感染。

This happens around half-moons, when weaker tides calm the water's surface, creating the perfect conditions for their sex cells to couple up.

这发生在半月时候，当较弱的潮汐让海面平静，为它们的生配对创造了完美的条件。

Typically a gamete with 23 chromosomes, including one sex chromosome either X or Y, develops when parent germ cells undergo the process of meiosis.

正常的配子包含23条染色体，其中有一条X或Y性染色体，由亲代生减数分裂产生。

Histologically, prominent features include large, round tumor cells resembling germline tumors; or small cells forming Homer-Wright rosettes.

松果体瘤主要的组织学特征包括类似生肿瘤中巨大圆形的肿瘤，或是形成Homer-Wright菊形团的小。

This is possible because organisms evolve when random mutations happen in the DNA of reproductive cells.

这是可能的，因为当生的DNA发生随机突变时，生物就会进化。

The idea that one scientist could make the leap towards editing reproductive cells has been condemned, but it has not been ruled out.

一位科学家可在编生方面取得很大进步的这种观点遭到谴责，但并没有被完全否定。

The other option is the sister chromatids of the x chromosome don't separate in meiosis two in the female germ cell.

女性生中，X染色体姐妹染色单体在第二次减数分裂时没有分离。

It does not always involve strictly female and male individuals with differently sized sex cells that fuse internally.

它并不总是严格涉及拥有不同大小内部融合的生的女性和男性个体。

Early on in meiosis the germ cell makes a copy of all of its chromosomes with each chromosome having sister chromatids at that point.

减数分裂早期，生会复制原先的染色体，复制完毕后，所有的染色体都有了姐妹染色单体。

Unless land organisms return to the water to reproduce or have specially adapted sex cells, their options are limited.

除非陆地生物回到水中繁或有特别适应的生，否则它们的选择是有限的。

Many algae, for example, have sex cells that are indistinguishable in size.

例如，许多藻类的生大小难以区分。

Its stable temperature and high density help preserve and disperse reproductive cells.

稳定的温度和较高的密度有助于保存和分散生。

However, each reproductive cell has only 23 individual chromosomes.

然而，每个生只有 23 条独立的染色体。

That's where the so-called germ cells are.

那就是所谓的生所在之处。

Okay, and so most of your fertilized offspring gametes are going to perish.

好的，所以你们大部分受精的后代生都会死亡。