Cell division
- Created by: Sarah
- Created on: 15-04-13 12:21
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- Cell division
- Mitosis
- Makes new cells for growth and repair
- A cell reproduces itself by splitting to form two identical offspring
- Body cells
- Have 23 pairs of chromosomes
- Have two copies of each chromosome
- The cell duplicates its DNA
- This forms X shaped chromosomes- the left and right 'arms' are identical
- The chromosomes line up at the centre and the arms are pulled apart by cell fibres
- Mebranes form around the new sets of chromosomes - nuclei
- The cytoplasm divides
- Mebranes form around the new sets of chromosomes - nuclei
- The chromosomes line up at the centre and the arms are pulled apart by cell fibres
- This forms X shaped chromosomes- the left and right 'arms' are identical
- Meiosis
- Produces cells which have half the number of normal chromosomes
- Gametes
- Have 23 chromosomes
- Can combine one from the mother and one from the father
- Get a body cell
- Body cells
- Have 23 pairs of chromosomes
- Have two copies of each chromosome
- Body cells
- Get a body cell
- The cell duplicates its DNA
- This forms X shaped chromosomes- the left and right 'arms' are identical
- The chromosome pairs line up at the centre and are pulled apart
- Each new cell only has one copy of each chromosome
- The chromosomes line up at the centre and the arms are pulled apart by cell fibres
- End up with 4 gametes
- The chromosomes line up at the centre and the arms are pulled apart by cell fibres
- Each new cell only has one copy of each chromosome
- The chromosome pairs line up at the centre and are pulled apart
- This forms X shaped chromosomes- the left and right 'arms' are identical
- Mitosis
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