On the inside, the fallopian tubes have smooth muscle with an inner lining that has ciliated cells that slowly sweep the secondary oocyte or zygote towards the uterus.

输管内是有纤毛细胞覆盖平滑肌，这些纤毛可以缓慢地将次级母细胞或者受精向子宫运输。

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

生殖细胞和受精区别是什么？

In fact, it's even more rigged than birth rates show — human conception results in about 150 male zygotes for every 100 females!

事实上，它操纵比现在出生率更夸张——人类受孕结果是，每 100 个女性胚胎就有大约 150 个男性胚胎！

Once the sperm arrives, it fuses with the egg to make a zygote — a cell that contains all the DNA needed to make a baby, thanks to the combination of the two DNA halves.

一旦精子到达，它就会与子融合，形成受精——由于两半 DNA 结合，受精包含了制造婴儿所需所有 DNA。

So, conception results in a single cell the zygote, that divides, over and over again, essentially producing every kind of cell in the body.

受孕形成一个单一受精细胞，它一次又一次地不断分裂，基本上形成了身体内所有细胞。

An IUD, or intrauterine device, is a small T-shaped object a medical provider inserts into the uterus to prevent zygotes from implanting.

宫内节育器，或称宫内节育器，是医疗提供者插入子宫以防止受精着床小型 T 形体。

But for now you learned about the four phases of the human sexual response, how a sperm finds and fertilizes an egg, creating a zygote, and how different types of contraception work to prevent that from happening.

但是现在你了解了人类性反应四个阶段，精子如何找到子并使其受精，产生受精，以及不同类型避孕措施如何防止这种情况发生。

First, they all start as single-celled zygotes — made from a sperm cell and egg cell combo — that become multicellular embryos: the tiny beginnings of roots, stems, and leaves.

首先，它们都是从单细胞受精开始——由精子细胞和细胞组合而成——然后变成多细胞胚胎：根、茎和叶微小开端。

When the membranes of the two pronuclei rupture, chromosomes go flying, and boom, you officially have a diploid zygote, which almost immediately starts mitosis.

当两个原核细胞膜破裂时，染色体飞舞，嘣，你正式有了一个二倍体合子，它几乎立即开始有丝分裂。

The zygote then grows into a long, thin stalk with a capsule on top — not very moss-like at all.

然后，受精长成一根又长又细茎，顶部有一个蒴果——一点也不像苔藓。

And so a zygote is an egg that's fertilized by a sperm.

因此，合子是指由精子受精子。

Upon successful fertilization, the zygote immediately begins developing into an embryo and takes about three days to reach the uterus.

成功受精后，受精立即开始发育成胚胎，大约需要三天时间到达子宫。

The first stage is called a " zygote" , the baby or the zygote is, like, tiny, tiny.

第一阶段称为“受精”，婴儿或受精很小很小。

This specialization makes DNA from non-sex cells particularly unsuited for cloning purposes because those tags and tangles make it hard for the clone zygote to divide.

这种特化使得非性细胞 DNA 特别不适合克隆目，因为这些标签和缠结使克隆受精难以分裂。

This is a zygote to make more cells and eventually makes sex cells to make the next generation.

这是一个受精，用来产生更多细胞，最终会生成生殖细胞以繁衍下一代。

As a result, almost every time a zygote tries to divide, the process malfunctions.

结果，几乎每次受精试图分裂时，过程都会发生故障。

Sometimes we'll actually have organisms living in the same area and the sperm and the egg will get together but that zygote may die.

有时，我们会发现生体生活在同一区域，精子和子能够结合，但形成合子可能会死亡。

Cloned zygotes are not reliable because while all other cells in the body do contain a full set of DNA, these other cells optimize their DNA to best serve their own particular functions.

克隆受精并不可靠，因为虽然体内所有其他细胞确实含有全套 DNA，但这些其他细胞会优化其 DNA 以最好地发挥其自身特定功能。

Figuring out how we go from that first zygote or that first fertilized egg to an embryo and then eventually to a baby and eventually to you.

弄清楚我们是如何从最初受精变成胚胎，然后最终成为婴儿，再变成你过程。

And so that's an example of zygote mortality.

这就是合子致死例子。