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

然后是配子减数分裂，因为它们（配子）是不同。

The answer lies within the amazing process of meiosis.

答案就在减数分裂过程中。

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

第一次细胞分裂，即第一次减数分裂后，配对同源染色体分离。

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

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

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

但是在出时候，卵母细胞停止发育——它们卡在减数分裂第一阶段。

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

在减数分裂过程中，一个细胞分裂两次，形成四个子细胞。

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

第二次细胞分裂，也就是第二次减数分裂后，每个染色体姐妹染色单体分离。

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

然后它们快速通过减数分裂 II，它们产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裂一期，形成两个较小单倍体细胞，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.

减数分裂 2 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.

这些结构对减数分裂 1 下一步细胞分裂过程至关重要。

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

减数分裂不同阶段是：间期，减数分裂 1，胞质分裂 1，减数分裂 2，胞质分裂 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裂和克雷布循环。

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

简而言之，在减数分裂过程中， 即产配子 [3] 过程中，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裂，而一个一中大概只有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.

减数分裂是一个分裂过程，单个细胞分裂两次，产四个细胞，其中包含一半原始遗传信息。

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

减数分裂 1 按以下步骤进行：前期 1前期 1 通常是减数分裂最长时期。

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裂中期停止分裂，并且在卵泡期向黄体期转换时候等待受精。

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，是由减数分裂形成。

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裂 II 并正式成为卵子。