The individual chromosomes line up at the equator of the cell.

单个染色体排列在细胞的中央线上。

However, each reproductive cell has only 23 individual chromosomes.

然而，每个生殖细胞只有 23 条独立的染色体。

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。