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The Process Of Mitosis Essay

474 words - 2 pages

The Process of Mitosis

Mitosis is the term used to describe cell division for replication. The product
at the end of mitosis is two daughter cells both genetically identical to the
original (parent) cell. This process (mitosis) is used for growth and repair
within an organism (and also for asexual reproduction).

There are five main stages to mitosis, called Interphase, Prophase, Metaphase,
Anaphase and Telophase. Although the process has been divided up into these
stages the process of mitosis is actually continuous.

Interphase --------------------------------------- In this, the first stage the
cell will look just like any other 'normal' cell although this is far from the
case because very much is actually happening. All cell organelles are being
produced in quantity and the chromosomes - DNA molecules are being copied
exactly. The two identical copies of DNA are called a "pair of chromatids" and
they are linked together by an item called a "chromomere". During this stage a
store of ATP is also built up.

[Best put a labelled diagram of a cell during Interphase here.]

Prophase --------------------------------------- In this second stage changes to
the cell become visible. The chromosomes condense, coiling up to about 5% of
their original length, now clearly visible when a stain is added. The centrioles
move to the opposite poles of the cell and small microtubules around the
centrioles become visible (called "Asters"). The nuclear membranes and nucleolus
disintegrate after passing their nucleic acids to certain pairs of chromatids.
Now a spindle forms, this is also made out of microtubules.

[A labelled diagram of the end of...

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