Mutations. Do Now – word ladder desk book Complete the word ladder below. Porch Pier Stone Castle chess piece How to do a word ladder You can change only.

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Presentation transcript:

Mutations

Do Now – word ladder desk book Complete the word ladder below. Porch Pier Stone Castle chess piece How to do a word ladder You can change only 1 letter at a time. The new word must make sense.

What is a mutation? Definition A mutation is a change in the DNA code. A gene mutation is a change in the order of bases on a strand of DNA.

Examples of mutations Blue eye colour is a mutation. Brown was the only eye colour around until there was a mutation in the gene for eye colour.

Examples of mutations Sickled cell anaemia is a mutation in the red blood cells. Cause many nasty symptoms. The major problem is getting enough oxygen to your body cells. Very very nasty!

Examples of mutations Very rare mutation! Would this kiwi survive in the wild to breed?

Where do mutations happen? Somatic (body) cellsGametes (sex) cells

Mutations Somatic cells A melanoma is an example of a mutation happening in the skin cells of a person. The DNA of a skin cell is damaged by UV. If the person gets cancer, it cannot be passed onto its offspring (baby). Gametes A mutation in the gametes DNA happens when the gamete is being made by meiosis. The mutation is then passed onto the offspring.

Variation Mutations are a source of variation. Variation means _______________________. If there is variation in a population then there are differences in the phenotypes. If there are different phenotypes then there must be different genotypes. If the genes are different the DNA sequence must also be different. Variation is important for the survival of a population.