Cell Division
Cell division is the process by which a parent cell divides to produce new cells. It is essential for growth, repair, reproduction, and maintaining living organisms.
There are two main types of cell division:
1. Mitosis
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Mitosis produces two genetically identical diploid daughter cells. It occurs in body (somatic) cells and is responsible for:
Growth
Tissue repair
Replacement of worn-out cells
Asexual reproduction in some organisms
The stages of mitosis are:
Prophase: Chromosomes condense and become visible.
Metaphase: Chromosomes align at the cell's equator.
Anaphase: Sister chromatids separate and move to opposite poles.
Telophase: New nuclear membranes form around each set of chromosomes.
Cytokinesis: The cytoplasm divides, producing two daughter cells.
2. Meiosis
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Meiosis produces four genetically different haploid cells (gametes), such as sperm and egg cells. It is important for:
Sexual reproduction
Maintaining the chromosome number across generations
Creating genetic variation through crossing over and independent assortment
Differences between Mitosis and Meiosis
| Feature | Mitosis | Meiosis |
|---|---|---|
| Number of divisions | 1 | 2 |
| Daughter cells | 2 | 4 |
| Chromosome number | Same as parent (diploid) | Half of parent (haploid) |
| Genetic makeup | Identical | Genetically different |
| Occurs in | Body cells | Reproductive cells |
In summary, mitosis is used for growth and repair, while meiosis is used to produce reproductive cells for sexual reproduction.