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Dr.Hadeer

Egypt
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60-min

/h

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Mitosis and Meiosis - Third Preparatory Grade - First Semester Translate this text using Google Translate.

Mitosis and Meiosis - Third Preparatory Grade - First Semester Translate this text using Google Translate.

First: Mitosis ✳️ Definition: It is a cell division that occurs in somatic cells (such as skin and muscle cells), and its purpose is growth and replacement of damaged cells. 🔁 Result: This results in two perfectly identical cells, each with the same number of chromosomes (46 in humans). 📘 Its importance: Growth - Tissue regeneration Wound healing 🧠 Stages of mitosis: 1. Prophase: Chromosomes begin to appear 2. Metaphase: The chromosomes are aligned in the middle of the cell. 3. Anaphase: The chromosomes separate and move to the ends. 4. Final: Two new nuclei are formed --- 🧪 Second: Meiosis ✳️ Definition: It is a division that occurs in reproductive cells (eggs and sperm), and its purpose is to reduce the number of chromosomes by half in preparation for reproduction. 🔁 Result: This results in four asymmetrical cells, each containing half the number of chromosomes (23 in humans). 📘 Its importance: - Production of reproductive cells Maintaining a constant number of chromosomes in living organisms - Increase genetic diversity among individuals 🧠 Stages of meiosis: It consists of two successive divisions: First division: Reduction in the number of chromosomes - Second division: Similar to mitosis, to form 4 cells

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