What phase of meiosis do nuclear membrane reforms cytoplasm divides and 4 daughter cells are formed?
The Correct Answer and Explanation is :
The phase of meiosis in which the nuclear membrane reforms, the cytoplasm divides, and four daughter cells are formed is Telophase II of meiosis.
Explanation:
Meiosis is a type of cell division that results in four non-identical daughter cells, each with half the number of chromosomes as the original cell. It occurs in two stages: meiosis I and meiosis II. Each of these stages has four phases: prophase, metaphase, anaphase, and telophase.
In Meiosis I, homologous chromosomes are separated into two different cells, reducing the chromosome number by half. The key events in Meiosis I are:
- Prophase I: Chromosomes condense, homologous chromosomes pair up, and genetic recombination (crossing over) occurs.
- Metaphase I: Homologous chromosome pairs align in the center of the cell.
- Anaphase I: Homologous chromosomes are pulled apart to opposite poles.
- Telophase I: Nuclear membranes reform, and the cell undergoes cytokinesis, dividing the cytoplasm to form two haploid cells.
After Meiosis I, the two haploid cells undergo Meiosis II, which is similar to mitosis but with no further chromosome replication.
In Meiosis II, the sister chromatids of each chromosome are separated into four haploid cells. The phases of Meiosis II are:
- Prophase II: Chromosomes condense again in both haploid cells.
- Metaphase II: Chromosomes align along the center of the cell.
- Anaphase II: The sister chromatids are pulled apart to opposite poles.
- Telophase II: The nuclear membrane reforms around each set of chromatids, the cytoplasm divides (cytokinesis), and four haploid daughter cells are formed, each with one set of chromosomes.
Thus, Telophase II is the final stage of meiosis where the cell division process culminates, resulting in four genetically unique daughter cells, each with half the original chromosome number. This is crucial for sexual reproduction, as it ensures genetic diversity and maintains chromosome number across generations.