1. Mitosis: This is the process of creating two identical daughter cells. It's used for growth, repair, and development.
Here's how it works:
* Interphase: The cell grows, copies its DNA, and prepares for division.
* Prophase: The duplicated chromosomes condense and become visible. The nuclear membrane breaks down, and the spindle fibers form.
* Metaphase: The chromosomes line up in the middle of the cell, attached to the spindle fibers.
* Anaphase: The sister chromatids separate and move to opposite poles of the cell.
* Telophase: The chromosomes reach the poles, and the nuclear membrane reforms around each set of chromosomes. The cell begins to divide.
* Cytokinesis: The cytoplasm divides, resulting in two separate daughter cells.
2. Meiosis: This is the process of creating four daughter cells with half the number of chromosomes as the parent cell. It's used for sexual reproduction.
Here's how it works:
* Meiosis I:
* Prophase I: Chromosomes condense, homologous chromosomes pair up, and crossing over occurs (exchange of genetic material between homologous chromosomes).
* Metaphase I: Homologous chromosome pairs line up in the middle of the cell.
* Anaphase I: Homologous chromosomes separate and move to opposite poles.
* Telophase I: The cell divides, resulting in two daughter cells with half the number of chromosomes.
* Meiosis II:
* This is similar to mitosis, but with only half the number of chromosomes.
* The sister chromatids separate, and four daughter cells are produced.
In summary:
* Mitosis creates two identical daughter cells for growth and repair.
* Meiosis creates four daughter cells with half the number of chromosomes for sexual reproduction.
Both processes ensure that the genetic information is passed on accurately to the daughter cells.
