Then there is Meiosis for our gametes, because they (gametes) are different.

然后是配子减数分，因为它们（配子）是不同的。

The answer lies within the amazing process of meiosis.

答案就在惊人的减数分中。

During the first cellular division called meiosis I, the chromosomal pairs are separated.

第一次细胞分，即第一次减数分后，配对的同源染色体分离。

The end result of meiosis 2 is production of four haploid cells, n chromosomes; (23 in humans) .

减数分 2 的最终结果是产 4 个单倍体细胞，n 条染色体；(人类为 23 条)。

But right around birth, the oocytes stop developing — they get stuck in the first stage of meiosis.

但是在出的时候，卵母细胞停止发育——它们卡在减数分的第一阶。

During meiosis, one cell divides twice to form four daughter cells.

在减数分中，一个细胞分两次，形成四个子细胞。

In the second cellular division called meiosis II, the sister chromatids of a given chromosome are separated.

第二次细胞分，也就是第二次减数分后，每个染色体的姐妹染色单体分离。

They then rush through meiosis II, and their resulting daughter cells total four round spermatids.

然后它们快速通减数分 II，它们产的子细胞总共有四个圆形精子细胞。

These primary spermatocytes then go into meiosis I, and form two smaller haploid cells called secondary spermatocytes.

这些初级精母细胞随后进入减数分一期，形成两个较小的单倍体细胞，称为次级精母细胞。

The four main steps of meiosis 2 are: prophase 2, metaphase 2, anaphase 2, and telophase 2.

减数分 2 的四个主要步骤是：前期 2、中期 2、后期 2 和末期 2。

These structures are critical for the process of cell division in next step at meiosis 1.

这些结构对减数分 1 的下一步细胞分至关重要。

Here are the distinct phases of meiosis: INTERPHASE MEIOSIS 1 CYTOKINESIS 1 MEIOSIS 2 CYTOKINESIS 2.

减数分的不同阶是：间期，减数分 1，胞质分 1，减数分 2，胞质分 2。

Now we can go straight onto meiosis and the Kreb cycle.

现在我们可以直接进入减数分和克雷布循环。

To put it simply, during meiosis, the process in which gametes[3] are created, chromosomal crossover occurs.

简而言之，在减数分中， 即产配子 [3] 的中，会发染色体交叉。

To do this, the primary oocytes have to complete meiosis 1, and in a person's lifetime only about 400 successfully do that.

要变成配子就必须要经历第一次减数分，而一个人的一中大概只有400个初级卵母细胞可以做到。

Meiosis is a process where a single cell divides twice to produce four cells containing half the original amount of genetic information.

减数分是一个分，单个细胞分两次，产四个细胞，其中包含一半的原始遗传信息。

Meiosis 1 takes place in following steps: Prophase 1 Prophase 1 is typically the longest phase of meiosis.

减数分 1 按以下步骤进行：前期 1前期 1 通是减数分的最长时期。

The secondary oocyte stops in metaphase of meiosis 2, and waits for fertilization as the menstrual cycle transitions into the luteal phase.

次级卵泡会在第二次减数分中期停止分，并且在卵泡期向黄体期转换的时候等待受精。

You'll remember from biology that gametes are haploid cells, meaning that they only have one set of chromosomes, and are formed by meiosis.

你会记得物学中配子是单倍体细胞，这意味着它们只有一套染色体，是由减数分形成的。

Now, only if and when an egg fuses with a sperm does it actually complete meiosis II and officially become an ovum.

现在，只有当卵子与精子融合时，它才真正完成减数分 II 并正式成为卵子。