Topic 1.3 - Cell Division
- Created by: Alice Cullen
- Created on: 25-12-16 11:04
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- The nucleus of a cell contains chromosones
- Chromosones carry genes that control the characteristics of the body
- Each chromosone carries a large number of genes
- Chromosones carry genes that control the characteristics of the body
- Many genes have different forms called alleles
- These may produce different characteristics
- In body cells the chromosones are normally found in pairs
- Body cells divide by mitosis to provide additional cells during growth or to produce replacement cells
- When a body cell divides by mitosis:
- Copies of the genetic material are made
- The cell then divides once to form two genetically identical body cells
- Cells in reproductive organs divide to form gametes
- A cell divides to form gametes by meiosis
- When a cell divides by meiosis to form gametes:
- Copies of the genetic material are made
- The cell then divides twice to form 4 gametes, each with a single…
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