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Carolyn Lowe

on 10 November 2012

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Transcript of Mitosis

Replication: the cell get ready to divide. They
create an identical set of DNA. Mitosis:
the CellCycle Prophase Metaphase The chromosomes are lined up across the middle of the cell. Anaphase The spindle fibers shorten pulling the identical sides of the chromosomes apart. Telophase During telophase several steps take place:
The DNA begins to decondense into chromatin again.
Two nuclear membranes form.
The spindle fibers disappear. Interphase The cell isn't dividing -
it is busy doing what cells do.
The DNA is all strung out so it is available for making proteins. The strands of DNA are called chromatin. Several important steps happen after replication:
The DNA begins condensing or wrapping around proteins called histones and forms chromosomes.
Each strand of identical DNA makes 1/2 of a chromosome which is called a chromatid. The two chromatids are connected at a place called the centromere.
The nuclear membrane disappears
Centrioles appear and separate to 180 degrees apart in the cell
Spindle fibers form connecting the centrioles to the chromosome
There are too many "C" words!!! Cells separate into two. In cells without cell walls the membrane pinches off in the middle. In cells with cell walls a double membrane forms across the center and it then forms new cell walls between. Cytokinesis Back to Interphase Chromosome Chromatid Centromere All these cells are in interphase.
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