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Title: AQA AS BIOLOGY MITOSIS
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.

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Cell Division can either take place by Mitosis or Meiosis:

Cell division in Prokaryotic cells:

Mitosis: produces two daughter cells that have the same number of chromosomes as the parent cell and each other
...


Meiosis: produces four daughter cells, each with half the number of chromosomes of the parent cell
...


Mitosis is the division of a cell that results in each of
the daughter cells having an exact copy of the DNA
of the parent cell
...

Mitosis
The importance of Mitosis:

Growth: if a new organism is to
resemble its parents, all the cells
that grow from this original cell
must be genetically identical
...

Reproduction: single-celled organisms divide by mitosis to give two
new organisms
...
The two copies of
the DNA after replication remain joined at a place called a centromere
...
Organelles called centrioles move to
opposite ends (poles) of the cell
...
Collectively, these spindle fibres are
called the spindle apparatus
...
Each chromatid is
an identical copy of DNA from the parent cell
...
Microtubules from the poles are attached and the chromosomes are pulled along the spindle apparatus and arrange themselves across
the equator of the cell
...
They move rapidly to their opposite poles of the cell and we now refer to them as chromosomes
...

Spindle fibres disintegrate and the nuclear envelope and nucleolus reform
...



Title: AQA AS BIOLOGY MITOSIS
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.