The answer lies within the amazing process of meiosis.

答案就在惊人的减数过程中。

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

然后是配子减数，因为它们（配子）是不同的。

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

第一次细胞，即第一次减数后，配对的同源染色体离。

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

在减数过程中，一细胞两次，形成四子细胞。

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

减数 2 的最终结果是产 4 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——它们卡在减数的第一阶段。

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

第二次细胞，就是第二次减数后，每染色体的姐妹染色单体离。

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 II，它们产的子细胞总共有四圆形精子细胞。

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一期，形成两较小的单倍体细胞，称为次级精母细胞。

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

这些结构对减数 1 的下一步细胞过程至关重要。

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

减数 2 的四主要步骤是：前期 2、中期 2、后期 2 和末期 2。

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

减数的不同阶段是：间期，减数 1，胞质 1，减数 2，胞质 2。

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

现在我们可以直接进入减数和克雷布循环。

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

简而言之，在减数过程中， 即产配子 [3] 的过程中，会发染色体交叉。

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

减数 1 按以下步骤进行：前期 1前期 1 通是减数的最长时期。

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，而一人的一中大概只有400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.

减数是一过程，单细胞两次，产四细胞，其中包含一半的原始遗传信息。

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中期停止，并且在卵泡期向黄体期转换的时候等待受精。

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 II 并正式成为卵子。

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

女性殖细胞中，X染色体姐妹染色单体在第二次减数时没有离。