Saturday, September 25, 2010

What goes on in each stage of mitosis?

There are 6 stages of mitosis:


  1. Interphase-DNA has replicated, but has not formed the condensed structure of chromosome.

  2. Prophase-DNA molecules progressivly shorten by coiling, to form chromosomes.

  3. Metaphase-the spindle fibres attach themselves to the centromeres of the chromosomes and align the chromosomes at the equatorial plate.

  4. Anaphase-the spindle fibres shorten and the centromere splits, separated sister chromatids are pulled along behind the centromeres.

  5. Telophase-the chromosomes reach the poles of their respective spindles. Nuclear envelope reform before the chromosomes uncoil. The spindle fibres disintegrate.

  6. Cytokinasis-the process of splitting the daughter cells apart. A furrow forms and the cell is pinched in two. Each daughter cell contains the same number and same quality of chromosomes.

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