|Mitosis Lab||SUPER VLB|
In telophase, the elongation of cells that began in anaphase continues. Two new nucleoli and nuclear envelopes form and the chromatin fibers from each chromosome uncoil inside them. Finally, the mitotic spindles disappear and mitosis is finished.
Cytokinesis is not a part of mitosis, yet is needed for the replication of the cell and typically happens during telophase. In animal cells, the cytoplasm develops a cleavage furrow running along the cell. At the furrow are microfilaments made up of the protein actin which helps it contract. The furrow continues to contract and deepen the furrow untill eventually the parent cell is pinched in two. The process is different in plant cells, however, because they contain a cell wall. First, membrane-enclosed vesicles containing cell wall materiel collect in the middle of the parent cell. Then, the vesicles fuse, forming a cell plate. The cell plate grows outward with the addition of more vesicles untill it fuses with the plasma membrane, where the parent cell splits into two daughter cells.
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