In animal cells, the first sign of cytokinesis is the appearance of an indentation around the middle of the cell. The ring contracts like the pulling of a drawstring and pinches the parent cell in two. Because the two new nuclei are forming at the ends of the cell, cytokinesis results in two new cells.In cytokinesis a cell plate forms inside the cell and grows outward. Eventually this new piece of cell wall divides the cell in two. The result is two daughter cells, each bounded by its own continuous membrane and its own cell wall.


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The processes are reversed. In telophase the spindle disappears, two nuclear envelopes reform and the chromosomes uncoil and lengthen, and the nucleoli reappear. Mitosis, the division of one nucleus into two genetically identical daughter nuclei, is now finished.In prophase, in the nucleus, the chromatin fibers have condensed.The chromosomes consist of a pair of sister chromatids joined at the centromere. The nucleolus disappears, and the cell stops making ribosomes.The nuclear envelope breaks down.A spindle forms. The chromatids now attach to the microtubules that make up the spindle.
first stage of mitosis and of meiosis I and II, when the already replicated chromosomes condense ○ Centrioles migrate to the poles ○ Anchor ○ Spindle fiber forms
second stage of mitosis and of meiosis I and II when the spindle is fully formed and all of the chromosomes are held in place, ○ Spindle fibers attach to centromeres ○ Chromosomes align midway between centrioles
third phase of mitosis and of meiosis I and II, in which the sister chromatids separate and move toward the poles of the spindle ○ Spindle fibers contract and pull the sister chromatids toward the centrioles
final stage of mitosis and of meiosis I and II, in which the chromosomes reach the spindle poles, nuclear envelopes form around each set of daughter chromosomes, and the nucleoli reappear
disk containing cell wall material that develops in plant cells during cytokinesis, eventually dividing the cell into two daughter cells
plant harmone that stimulates cell division ○ Begins during telophase of mitosis ○ Continues as the 2 new cells form ○ 2 daughter cells may have varying amounts of cytoplasm and organelles, but they share identical genetic information
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