why and how some spindle fibres elongate and some contract?
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Explanation:
Spindle fibers are microscopic protein structures which help divide genetic material during cell division. The spindle fibers form out of the centrosome, also known as the microtubule-organizing center, or MTOC. Spindle fibers are formed from microtubules with many accessory proteins which help guide the process of genetic division. The spindle fibers form during cellular division near the poles of the dividing cell. As they extend across the cell, the search for the centromere of each chromosome. The centrosome, or MTOC, always has some microtubules preassembled. On the surface of the MTOC are small proteins, responsible for lengthening or shortening the microtubules. These proteins respond to signals from the cell, and when it is time for cell division, the begin lengthening the spindle fibers. To do this, they must add subunits of alpha-tubulin and beta-tubulin. Together, these two small proteins form the structure of a microtubule. Many individual microtubules together are called spindle fibers. A single microtubule can be seen in the graphic below.
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