后期i和后期II之间的差异

这关键区别between anaphase I and anaphase II is that在后期i期间，同源染色体are separated and are pulled towards the opposite poles while during the anaphase II,姐妹染色质酸分开并将其拉向相反的细胞极点。

有丝分裂和减数分裂are two forms of nuclear division that occur in a cell. As a result of mitosis, the nucleus divides into two daughter cells, and each has the same chromosomal number as the parent nuclei. However, in meiosis, the number of nuclear chromosomes that daughter cells have is halved from the parent nuclei. Meiosis occurs during the formation of sex cells such as sperms and eggs in order to carry out sexual reproduction. Hence, as a result of meiosis, one parent cell produces four daughter cells that contain half of the chromosomes of the parent cell.

此外，遗传重组发生在减数分裂期间。因此，所产生的配子在遗传上是不同的，而所产生的后代在遗传上也不同。减数分裂包括两个连续的核分裂；即减数分裂I和减数分裂II。减数分裂I和减数分裂II都有四个阶段，即前期，中期，后期，以及telophase。

CONTENTS

1。概述和关键差异
2。什么是后期我
3。什么是后期我I
4。后期i和后期II之间的相似性
5。并排比较 - 表格形式的后期I与后期II
6。Summary

什么是后期我?

后期I是减数分裂I的子相。它是在中期I之后开始的。在中期I期间，两个同源染色体对排列在细胞的赤道中，它们的centromeres与来自细胞的每个极极的纺锤纤维附着。一旦这种染色体排列结束，我就开始了。

At the beginning of anaphase I, the cell starts to lengthen. As a result of the lengthening of the cell, spindle fibre stretch towards opposite poles, separating the homologous chromosomes into haploid sets. Hence, this is the main event that occurs during the anaphase I. After anaphase I, telophase I begin.

什么是后期II？

后期II发生在减数分裂II上，类似于有丝分裂的后期。后期II遵循中期II。在中期II的末尾，单倍体染色体在主轴的赤道周围排列。两个纺锤体（一个来自每个极点）与一个染色体的丝粒相连。

当我开始的后期时，主轴纤维将单倍体染色体拉到其杆上。由于这种力，Centromere分裂，姐妹染色单体在赤道旁边彼此分开。主轴纤维将姐姐的染色质素拉到各自的两极。因此，这是后期II期间发生的主要事件。

后期i和后期II之间有什么相似之处？

• 后期I和后期II是减数分裂的两个阶段。
• 在这些阶段，主轴纤维将染色体拉向其杆。
• 同样，纺锤纤维在两个阶段都变得缩短。

后期i和后期II有什么区别？

后期i和后期II之间的关键区别在于，在后期I期间，完整的染色体朝每个极点朝向每个杆，而在后期II期间，姐妹染色单体朝每个极点朝着每个极点。后期I发生在减数分裂I期间，而后期II发生在减数分裂II期间。因此，这也是后期I和后期II之间的差异。此外，当单元处于二倍体状态时，当单元处在单倍体状态时发生时，就会发生后期。因此，这是后期I和后期II之间的另一个区别。

此外,后期我进一步区别and anaphase II is the spindle attachment with the centromeres. In anaphase, I, centromeres of homologous chromosomes are attached to the spindle fibres so as the two spindle fibres are attached to the centromeres of each homologous chromosome. On the other hand, in anaphase II, both spindle fibres are attached to the same chromosome. Besides, during the anaphase, I, centromeres of the chromosomes do not split while during the anaphase II, centromeres split and sister chromatids separate in each chromosome. Hence, it is also a difference between anaphase I and anaphase II.

下面的信息图介绍了有关后期I和自源II之间差异的更多详细信息。

Summary – Anaphase I vs Anaphase II

Meiosis is one of the two cell divisions. It produces four daughter cells from one parent cell. Each cell contains half of the chromosomes of the parent cell. Meiosis occurs via two main processes; meiosis I and meiosis II. Each meiosis has four subdivisions. Anaphase I occurs in meiosis I while anaphase II occurs in meiosis II. The key difference between anaphase I and anaphase II is that during the anaphase I, the homologues chromosomes are pulled apart and move apart to opposite ends of the cell while during the anaphase II, sister chromatids of each chromosome are separated and are pulled towards the poles. Furthermore, anaphase I occur when the cell is in the diploid state while the anaphase II occurs when the cell is in the haploid state. Thus, this summarizes the difference between anaphase I and anaphase II.

参考：

1。“Meiosis.” Khan Academy, Khan Academy.在这里可用
2.“减数分裂。”Wikipedia，Wikimedia基金会，2019年1月18日。在这里可用

图片提供：

1。”Anaphase-1-meiosis”By Bharghavi Ravi Reddy – Own work,（CC BY-SA 4.0）通过下议院维基梅迪亚
2. Bharghavi Ravi Reddy的Aphashase 2“” - 自己的作品，（CC BY-SA 4.0）通过下议院维基梅迪亚