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

" 是前期，" 他同意判断，并在活页练习题第个空白处工整地记下来了。

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 四个主要步骤是：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.

第从婴儿期到青春期，初级卵母细胞还停留在第次减数分裂前期。

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，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 这，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.

次级卵泡中初级卵母细胞还是停留在第次减数分裂前期，而卵泡多了几层颗粒细胞，以及卵泡内膜细胞。