Mitosis and Asexual Reproduction

I. Mitosis or M Phase: Cell growth and protein production stop at this stage in the cell cycle. All of
    the cell's energy is focused on the complex and orderly division into two similar daughter cells. Mitosis
    is much shorter than interphase, lasting perhaps only one to two hours. As in both G1 and G2, there
    is a Checkpoint in the middle of mitosis (Metaphase Checkpoint) that ensures the cell is ready to
    complete cell division.

II.  Mitosis phases:
    Prophase: During this first mitotic stage, 1.the nucleolus fades and chromatin (replicated DNA and
                     associated proteins) condenses into chromosomes. 2.Each replicated chromosome
                     comprises two chromatids, both with the same genetic information. 3.Microtubules of the
                     cytoskeleton, responsible for cell shape, motility and attachment to other cells during
                     interphase, disassemble.

    Prometaphase: In this stage the 1. nuclear envelope breaks down so there is no longer a recognizable
                              nucleus. 2.Some mitotic spindle fibers elongate from the centrioles and attach to
                              kinetichores, protein bundles located on the chromosomes.

    Metaphase: Tension applied by the spindle fibers aligns all chromosomes in one plane at the center
                         of the cell.

    Anaphase: Spindle fibers shorten, the kinetichores separate, and the chromatids (daughter
                       chromosomes) are pulled apart and begin moving to the cell poles.

    Telophase: The daughter chromosomes arrive at the poles and the spindle fibers that have pulled
                       them apart disappear.

    Cytokinesis: 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.
 

III.  Asexual Reproduction:

        Asexual Reproduction