" Prophase, " he agreed, writing it neatly in the first space on our worksheet.

" 前期，" 他同意我的判断，并在我们的活页练习题的第一个空白处工整地了。

During prophase 1, homologous chromosomes pair and exchange DNA (homologous recombination) .

在前期 1，同源染色体配对并交 DNA（同源重组）。

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

减数分裂 2 的四个主要：前期 2、中期 2、后期 2 和末期 2。

The first stage lasts from infancy to puberty, and during this stage the primary oocyte remains stuck in the prophase step of meiosis 1.

第一阶段从婴儿期到青春期，初级卵母细胞还停留在第一次减数分裂的前期。

In prophase 2, we see the disappearance of the nucleoli and the nuclear envelope again as well as the shortening and thickening of the chromatids.

在前期 2，我们看到核膜消失，染色单体变短变厚。

Leptotene In this stage of prophase 1, individual chromosomes, each consisting of two sister chromatids, become " individualized" to form visible strands within the nucleus.

细线期细线期在前期 1 的这一阶段，单个染色体，每个染色体由两个姐妹染色单体组成，变得“个体化”，在细胞核内形成可见的染色体丝。

In a secondary follicle, the primary oocyte is still in the prophase step of meiosis 1, but now the follicle has additional layers of granulosa cells, as well as theca cells.

次级卵泡中的初级卵母细胞还停留在第一次减数分裂前期，而卵泡多了几层颗粒细胞，以及卵泡内膜细胞。