Each replicated chromosome comprises two chromatids, both with the same genetic information. Microtubules of the cytoskeleton, responsible for cell shape, motility and attachment to other cells during interphase, disassemble. And the building blocks of these microtubules are used to grow the mitotic spindle from the region of the centrioles. Some mitotic spindle fibers elongate from the centrioles and attach to kinetichores, protein bundles located on the chromosomes. Other spindle fibers elongate but instead of attaching to chromosomes, overlap each other at the cell center.
Tension applied by the spindle fibers aligns all chromosomes in one plane at the center of the cell.
The daughter chromosomes arrive at the poles and the spindle fibers that have pulled them apart disappear. The spindle fibers not attached to chromosomes begin breaking down until only that portion of overlap is left. It is in this region that a contractile ring cleaves the cell into two daughter cells. Microtubules then reorganize into a new cytoskeleton for the return to interphase. Here are some suggested keywords to focus your search.