Meiosis
- Created by: sxdewinder`
- Created on: 07-05-15 19:42
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- Cell division - Meiosis
- Gametes
- During sexual reproduction, two cells called gametes combine to form a new individual
- They only have one copy of each chromosome. Human body cells have 46 chromosomes and gametes have 23 each
- Involves 2 divisions
- Before the cell starts to divide, it duplicates its DNA-one arm of each chromosome is and exact copy of the other arm
- In the first division in meiosis the chromosome pairs line up in the centre of the cell
- The pairs are then pulled apart, so each new cell only has one copy of each chromosome
- In the second division the chromosomes line up again in the centre of a cell, the arms of the chromosomes are pulled apart
- You get four gametes each with only a single set of chromosomes in it
- Gametes
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