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Chromosomes (Each chromosome carries a large number of genes. Different…
Chromosomes
Each chromosome carries a large number of genes. Different genes control the development of different characteristics e.g. hair colour.
The cell cycle
- Body cells in multicellular organisms divide to produce new cells as part of a series of stages called the cell cycle
- The stage of the cycle when the cell divides is called Mitosis
- Multicellular organisms use Mitosis to grow or replace cells that have been damaged.
- The end of the cycle results in two new cells identical to the original cell, with the same number of chromosomes,
- You need to know about these two main stages of the cell cycle.
Growth and DNA replication
Mitosis
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Body cells normally have two copies of each chromosome - one from the organism's mother, and one form the father.
So humans have two copies of chromosome 1, two copies of chromosome 2 etc.
Most cells in your body contain a nucleus. The nucleus contains your genetic material in the form of chromosomes.Chromosomes contain genetic information. They are coiled lengths of DNA molecules
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