中期1和2之间的差异

Thekey differencebetween metaphase 1 and 2 is that在中期1中，homologous chromosomespair up at the metaphase plate while in metaphase 2, single chromosomes line up at the metaphase plate.

Meiosisis the process that converts a diploid cell into fourhaploid配子形成期间的细胞。这是一个重要的过程，因为它增加了后代之间的遗传多样性。减数分裂对于单倍体细胞形成的重要性，在性繁殖中至关重要。减数分裂是通过称为减数分裂I和减数分裂II的两个连续的核师发生的。每个核分裂都可以再次细分为前期，中期，Anaphase and Telophase. Hence, metaphase is the stage of cell division in which the chromosomes arrange along the Metaphase plate. Metaphase 1 can be found in meiosis I while metaphase 2 can be found in meiosis II. Metaphase 1 and 2 are different from each other.

内容

1.Overview and Key Difference
2.What is Metaphase 1
3.What is Metaphase 2
4.Similarities Between Metaphase 1 and 2
5.Side by Side Comparison – Metaphase 1 vs 2 in Tabular Form
6.概括

What is Metaphase 1?

中期1is the metaphase of meiosis 1. During this phase, the pairs of homologous chromosomes arrange on the metaphase plate of the cell, and then they bind to the meiotic spindle through centromeres. At this moment, the centrioles can be seen at the opposite poles of the dividing cell.

The pairs of homologous chromosomes get attached to the spindle fibres from each pole, at the opposite sides. At this stage, the cell contains a full set of chromosomes. Metaphase 1 occurs after prophase 1. Anaphase 1 is the next phase after metaphase 1.

What is Metaphase 2?

The metaphase found in meiosis 2 is known as metaphase 2. The events happening in metaphase 2 are similar to the metaphase of the mitosis. During the metaphase 2, single chromosomes arrange in the metaphase plate.

Hence it is different from the metaphase 1 since pairs of homologous chromosomes arrange in the metaphase plate. Then to each centromere of the chromosome, spindle fibres from each pole attach. At this stage, the cell contains half of the chromosomes that of in the parent cell. Metaphase 2 occurs after prophase 2. Anaphase 2 is the next phase after metaphase 2.

中期1和2之间有什么相似之处？

• 中期1and 2 are phases of meiosis.
• 它们涉及从二倍体细胞形成配子的形成。
• In both phases, chromosomes come into the middle of the cell.
• Furthermore, spindle fibres attach with centromeres of the chromosomes in each phase.

中期1和2的区别是什么?

Meiosis occurs through two cycles, which are meiosis 1 and 2. Each meiotic cycle has four subphases. Metaphase of the meiosis 1 is known as metaphase 1 while metaphase of the meiosis 2 is known as meiosis 2. In metaphase 1, pairs of homologous chromosomes line up at the middle of the cell while single chromosomes line up at the middle in metaphase 2. This is the difference between metaphase 1 and 2.

中期1和2之间的另一个主要区别是，在中期1中，纺锤纤维连接到每个同源染色体的两个丝粒上，而在中期2中，纺锤体纤维从两侧连接到一个中心仪上。

The below infographic presents the difference between metaphase 1 and 2 in tabular form for quick reference.

概括– Metaphase 1 vs 2

Meiosis is one of the two types of cell divisions. It requires the sexual reproduction for the formation of gametes. Meiosis has two major cycles namely first meiotic cycle and second meiotic cycle, and at the end, it results in four haploid daughter cells from a single diploid cell. In each meiotic cycle, there are four main phases. They are prophase, metaphase, anaphase and telophase. Metaphase 1 belongs to meiosis 1, and metaphase 2 belongs to meiosis 2. During the metaphase 1, pairs of homologous chromosomes arrange at the middle of the cell while in metaphase 2, single chromosomes arrange at the middle. This is the difference between metaphase 1 and 2.

Reference:

1.“Meiosis.” Khan Academy, Khan Academy.Available here

Image Courtesy:

1.”Meiosis Stages”By Ali Zifan – Own work(CC BY-SA 4.0)viaCommons Wikimedia
2.”Figure 11 01 04″ByCNX OpenStax,(CC BY 4.0)viaCommons Wikimedia