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  • Cytokinesis: How Cells Divide and Separate - Mechanisms & Processes
    The cell division process, specifically cytokinesis, is ended by the formation of a cleavage furrow in animal cells and a cell plate in plant cells. Here's a breakdown:

    Animal Cells:

    * Cleavage Furrow Formation: After the chromosomes are separated during mitosis, a ring of microfilaments composed of actin and myosin proteins forms just beneath the cell membrane. This ring contracts, pinching the cell membrane inward and eventually dividing the cell in two.

    Plant Cells:

    * Cell Plate Formation: Instead of a furrow, plant cells form a cell plate between the two daughter nuclei. Vesicles from the Golgi apparatus migrate to the center of the cell and fuse, depositing new cell wall material (cellulose) to form a new cell wall between the daughter cells. The cell plate eventually merges with the existing cell walls, completing the separation.

    In both cases, the following events signal the end of cell division:

    * Completion of cytokinesis: The cytoplasm is fully divided between the two daughter cells.

    * Nuclear envelope reformation: The nuclear membrane reforms around each set of chromosomes.

    * Cytoskeletal reorganization: The cytoskeleton of the parent cell is rearranged to accommodate the new daughter cells.

    Ultimately, these events ensure that each daughter cell receives a complete set of chromosomes, organelles, and cytoplasm, allowing them to function independently as new cells.

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