In meiosis how many cycles of chromosome devision occurs?
In Meiosis, there are two cycles of chromosome division called Meiosis I and Meiosis II.
Meiosis I:
During Meiosis I, the cell goes through a series of steps to separate homologous chromosomes, resulting in two daughter cells with half the number of chromosomes as the parent cell.
1. Prophase I:
In this phase, the chromatin condenses and becomes visible as chromosomes. Homologous chromosomes pair up and form structures called tetrad or bivalent. Crossing over occurs, where genetic material is exchanged between non-sister chromatids of homologous chromosomes. This genetic recombination increases genetic diversity.
2. Metaphase I:
The tetrads align along the cell's equator. Spindle fibers from opposite poles of the cell attach to each chromosome, preparing for separation.
3. Anaphase I:
The homologous chromosomes separate and move toward opposite poles of the cell, pulled by the spindle fibers. This ensures that each daughter cell receives one complete set of chromosomes.
4. Telophase I:
The chromosomes reach the poles of the cell, and the nuclear envelope reforms around each set of chromosomes. Cytokinesis then occurs, dividing the cell into two daughter cells.
Meiosis II:
Meiosis II is similar to mitosis, as it involves the separation of sister chromatids and results in the formation of four haploid daughter cells.
1. Prophase II:
The nuclear envelope dissolves, and the chromosomes condense. The spindle apparatus forms again.
2. Metaphase II:
The chromosomes align along the equator of each cell, with spindle fibers attaching to the centromeres.
3. Anaphase II:
The sister chromatids separate and move toward opposite poles of the cell.
4. Telophase II:
The chromosomes reach the poles of the cell, and the nuclear envelope reforms around each set of chromosomes. Cytokinesis occurs, resulting in the formation of four haploid daughter cells.
Overall, Meiosis involves two cycles of chromosome division, resulting in the formation of four genetically diverse haploid daughter cells.
In meiosis how many cycles of chromosome devision occurs?
2 cycles of chromosomes division occurs..
To make sure you are not studying endlessly, EduRev has designed Class 11 study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Class 11.