ii) Meiosis■ This process begins wh

ii) Meiosis
■ This process begins when Type B spermatogonia lose their contact with the
basement membrane to form preleptotene primary spermatocytes.
■ The preleptotene pringage in DNA synthesis and
condensation of individual chromosomes providing the appearance of thin
filaments in the nucleus which identify the leptotene stage. At this stage,
each chromosome consists of a pair of chromatids.
■ As the cells move into the zygotene stage, there is further thickening of
these chromatids and the pairing of homologous chromosomes.
■ The further enlargement of the nucleus and condensation of the pairs of
homologous chromosomes termed bivalents, provides the nuclear
characteristics of the pachyten stage primary spermatocyte.
■ During this stage, there is exchange of genetic material between homologous
chromosomes derived from maternal and paternal sources. The sites of
exchange of genetic material are marked by the appearance of chiasmata and
these become visible when the homologous chromosomes separate slightly
during diplotene. The exchange of genetic material involves DNA strand
breakage and repair.

結果 (中文) 1:

ii） 减数分裂■ 这个过程开始时 B 型精原细胞失去与他们接触向窗体 preleptotene 初级精母细胞基底膜。■ preleptotene pringage DNA 的合成和缩合的个体染色体提供的薄外观花丝在细胞核内查明细阶段。在这个阶段，每条染色体由一条染色单体组成。■ 当单元格移动到偶线期阶段，那里进一步增厚这些染色单体和同源染色体的配对。■ 原子核的进一步扩大和冷凝的成对的同源染色体称为二价体，提供核pachyten 阶段初级精母细胞的特征。■ 在这个阶段，还有之间同源的遗传材料的交换染色体来自母亲和父亲的来源。网站由交叉的外观标记遗传材料的交换和这些成为可见时同源染色体分离略在双线期。遗传材料的交换涉及 DNA 链破损和修复。

結果 (中文) 3:

减数分裂II）■这个过程开始时，B型精原细胞失去联系基底膜形成前细线期初级精母细胞。■preleptotene pringage和DNA的合成个别染色体的冷凝提供的外观薄在细胞核中，找出细线期丝。在这个阶段，每个染色体由一对染色单体。■当细胞进入偶线期，有进一步增厚这些染色体，同源染色体配对。■对对细胞核和冷凝的进一步扩大同源染色体称为体，提供核pachyten阶段的初级精母细胞的特点。■在这个阶段，有相应的遗传物质的交换关系来自母亲和父亲来源的染色体。的网站遗传物质的交换是由染色体的出现标志着，这些成为可见的，当同源染色体分开在双线期。遗传物质的交换涉及核酸链破损及修理。