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Transcript
CELL DIVISION PHASE 1 Interphase Chromosomes appeared as threadlike coils called chromatin. In animal cells, two structures called centrioles can be seen outside the nucleus. Centrioles play a part in cell division. Chromosomes are copied, the number of chromosomes doubles. Each chromosome and its sister are attached to the centromere. Now the sister chromosomes are called chromatids. PHASE 2 Prophase Mitosis begins. Centrioles begin to move to opposite ends of the cell. A spindle begins to develop between the two centrioles forming a “bridge” between the opposite ends. At the end, the nuclear membrane begins to break down. At the same time, the nucleolus in the nucleus disappears. PHASE 3 Metaphase Chromosomes attach to the spindle. Chromosomes are attached to the spindle by the centromere, which still connects each chromatid to its identical sister chromatid. It looks like the “World Globe”. PHASE 4 Anaphase Chromosomes begin to separate. Now the centromere splits and the sister chromatids separate from each other. Each chromatid from each pair of sister chromatids move to opposite ends along the spindle. Now the chromatids are again called chromosomes. PHASE 5 Telophase Two new nuclei form. Chromosomes begin to uncoil and lose their rodlike appearance. Now they again appear as chromatin and cannot easily be distinguished. A nuclear membrane forms and the nucleolus reappears in each cell. PHASE 6 Cytokinesis The cytoplasm divides in the cell. In plant cells, the cytoplasm is divided by a cell plate, which will become the new cell membrane and a cell wall also forms around each daughter cell.