The Cell Cycle And Mitosis.

Detailed notes covering the cell cycle and mitosis.

Covers the new OCR specification 2015.

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The Cell Cycle
The cell cycleis the process that all body cells in multicellular organisms use
to grow and divide.
Mitosis is the division of the nucleus.
It is needed for the growth of multicellular organisms and for repairing damaged tissues.
It is also a method of asexual reproduction.
It is one continuous process that can be divided into 4 stages.
Interphase is the period of preparation that begins at the beginning of one mitotic division
through to the next.
Interphase is subdivided into three separate growth stages; G1, S and G2.
ATP content is increased.
Organelle replication occurs.
All cellular content except the chromosomes are duplicated.
It is the longest period of preparation.
The cell checks that the chemicals needed for replication are present and for any damage
to the DNA before entering the S phase.
Cellular growth.
S Phase:

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Synthesis of new DNA replication.
At the end of S phase there are 92 chromosomes as they have all been duplicated.
The cell checks duplicated chromosomes for mutations and can make necessary repairs.
Cellular growth.
The chromosomes condense becoming shorter and fatter.
The chromosomes can be stained at this point.
Centrioles move to opposite ends of the cell.
The nuclear envelope breaks down and the chromosomes lie free in the cytoplasm.…read more


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