Genetic Variation
- Created by: Kamya Gopal
- Created on: 02-01-13 14:04
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- Genetic Variation
- Fertilsation
- 2) But, fertilisation is a bit random- you don't know which two gametes are going to join together.
- 1) Fertilisation is when the sperm and egg (with 23 chromosomes each) join together to form a new cell with the full 46 chromosomes.
- Gamete Formation
- 3) When these body cells split to form gametes the chromosomes also split up. This means that gametes end up with half the number of chromosomes of a normal body cell- 23.
- 2) The body cells they're made from hae 23 chromosomes. In each pair there's one chromosome that was inherited from your mother and one from your father.
- 4) In each gamete some of your dad's chromosomes are linked in with some of your mum's
- 1) Gametes are sperm cells and egg cells. Gametes are formed in the testes or ovaries.
- 5) This shuffling up of chromosomes leads to variation in the new generation.
- Mutations
- 2) This can create new characteristics, increasing variation.
- 1) Ocassionally a gene may mutate- this just means that it changes
- Fertilsation
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