State two important changes that chromosomes must undergo before cell division can take place.  

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Cells are comprised of very complex networks.  One of the most important structures having to do with cell division is the chromatin network, and it contains all the genetic material that will be passed on to the new cells.

When the cell receives instructions from the nucleus to divide, the...

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Cells are comprised of very complex networks.  One of the most important structures having to do with cell division is the chromatin network, and it contains all the genetic material that will be passed on to the new cells.

When the cell receives instructions from the nucleus to divide, the chromatin network changes into long thin bodies called chromosomes.  The chromosomes line up in the center of the cell and then divide equally, each half going to opposite ends of the cell.  When this is completed, they dissolve to form a new chromatin network for each new nucleus.  The rest of the cell divides as the nucleus splits and two new cells result.  This process is called mitosis.

When a male and female cell come together to form a new organism (i.e. human reproduction), the full number of chromosomes is again restored in the fertilized cell.  This  is called meiosis. 

 

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