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Cell functions - Reproduction & genetics - Mitosis & cytokinesis - Animal cell - Mitosis & Cytokinesis - Animal Cell: (Didelphis, Mammalia)
Mitosis & Cytokinesis - Animal Cell: (Didelphis, Mammalia)
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| Description |
Because they have relatively few chromosomes, the cells of the rat kangaroo are well suited for studying mitosis. This kidney derived cell is in prophase, the first stage of mitosis. The chromatin condenses and the nucleoli are broken down. The chromosomes are now clearly visible. At the upper right a chromosome which resembles the number 3 can be seen. The apical constriction of this chromosome is the kinetochore. The chromosomes become more and more shortened. The metaphase stage has been reached. The chromosomes are at their minimum length and have accumulated at the equatorial plane. Chromosome division begins at the kinetochores. The divided chromosomes, or chromatids as they are called, start migrating towards the poles. This stage of mitosis is referred to as anaphase. At the same time the cytoplasm begins to constrict. The chromosome accumulate in the middle of the forming daughter cells. New nuclear membranes are formed before the completion of the constriction process. At the site of constriction the remains of the spindle, called the Fleming body, can be seen. With the formation of two daughter cells the last step of mitosis, called telophase, is completed. The nuclei of the daughter cells are already fully formed, but have not yet reached the size of normal interphase nuclei.
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Sources
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Chromatidentrennung bei der Mitose. W.O. GROSS. Publ.: 1983. B&W, com. ger. 114 m, 101/2 min. -;PH;-.
IWF, Göttingen: D 1475
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Abbreviations
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Order |
For further films please search the IWF media catalogue for "cell biology".
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