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Contents
Cell Division and Fertilisation
Introducing cell division
What is mitosis?
Chromosomes and fertilisation
What is meiosis?
Mitosis or meiosis?
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How many cells?
An adult human is made up of about 50 billion cells.
That's 50 000 000 000 000 cells!
Everyone started out as just one single cell.
How does one cell become 50 billion?
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Cell division
New cells are produced by old cells dividing.
Why are new cells needed?
Growth and repair
of body cells.
Production of
specialised sex cells.
New cells are needed for two main reasons, so there are
two different types of cell division...
...mitosis and meiosis.
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Cell division and genetic information
Cells don't just split in half when they
divide. If they did, there wouldn't
be much of the cells left!
It is essential that the genetic
information carried in a cell
is transferred to new cells.
Where is genetic information
carried in a cell?
When a cell divides how can this genetic information
be transferred without any of it being lost?
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Cell division and chromosomes
Chromosomes in the nucleus carry
the genetic information of a cell.
Chromosomes must be accurately
copied and passed on during
cell division.
This is important to make sure
that no genetic information is lost.
Knowing about chromosomes and what happens to them
during cell division is the key to understanding the
differences between mitosis and meiosis.
© Boardworks Ltd 2004…read more

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