Mitosis Animation

Mitosis Animation - centrosome . During interphase, the...

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Mitosis Animation The link below is an animation that shows chromosome movement during mitosis in a hypothetical species with 2N = 4. Click here to begin the animation . After the screen opens, press Ctrl-F to view the animation in full screen mode. The Cell Cycle The cell cycle alternates between interphase and mitosis as diagrammed below. Mitosis has these four phases: prophase, metaphase, anaphase, and telophase. Prophase During prophase, chromosomes begin condensing (forming) as DNA becomes coiled. The genes cannot function (produce mRNA and therefore protein) when the DNA is coiled. Coiling facilitates movement. The nucleolus disappears. The nuclear membrane becomes fragmented and disappears by the end of prophase. A system of microtubules needed to move the chromosomes begins to form during prophase. The microtubules, also called spindle fibers , form from an area of the cell called the
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Unformatted text preview: centrosome . During interphase, the cell has one centrosome but just before prophase, the centrosome duplicates, producing a second centrosome. During prophase, microtubules radiate from each centrosome. Some of the microtubules extend from one centrosome toward the other. The entire complex of centrosomes and spindle fibers is called the spindle apparatus. Each centrosome of an animal cell contains two centrioles . Plant cells do not have centrioles but they do form spindle fibers. Kinetochores and Kinetochore Microtubules During prophase, protein plates called kinetochores form on the centromeres of each chromosome. Kinetochore microtubules are spindle fibers that attach to the kinetochores and move the chromosomes to the center of the cell. The next phase (Metaphase) begins when the chromosomes become aligned in the center of the cell....
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Mitosis Animation - centrosome . During interphase, the...

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