Cell Division
This lesson explains the concept and importance of Mitosis Cell Division and Meiosis Cell Division.
Cell division is the biological process by which a parent cell splits into two or more daughter cells. It is essential for growth, repair, and reproduction in all living organisms.
🔹 Types of Cell Division:
1. Mitosis (माइटोसिस):
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Occurs in body (somatic) cells.
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Produces 2 identical daughter cells.
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Used for:
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Growth
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Repair of tissues
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Asexual reproduction
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The number of chromosomes remains the same as the parent cell (diploid → diploid).
Phases of Mitosis:
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Prophase – Chromosomes condense, and the spindle forms
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Metaphase – Chromosomes align at the centre
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Anaphase – Chromatids separate and move to the poles
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Telophase – New nuclei form
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Cytokinesis – The Cell splits into two
2. Meiosis (मियोसिस):
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It occurs in sex cells (gametes), such as sperm and egg.
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Produces 4 daughter cells with half the number of chromosomes (haploid).
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Essential for sexual reproduction and genetic variation.
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Happens in two stages:
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Meiosis I: Homologous chromosomes separate
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Meiosis II: Sister chromatids separate
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🔹 Why Is Cell Division Important?
| Purpose | Role of Cell Division |
|---|---|
| Growth | Increases the number of cells |
| Repair | Replaces damaged or dead cells |
| Reproduction | Mitosis → asexual, Meiosis → sexual |
| Genetic Continuity | Ensures the inheritance of DNA |
| Variation | Meiosis causes genetic diversity |
🧠 Bonus Terms:
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Chromosome: DNA structure carrying genetic information
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Chromatid: Each half of a duplicated chromosome
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Centromere: Joins two chromatids
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Spindle fibres: Help pull chromosomes apart
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