Environmental - Variation that occurs during your lifetime e.g. scars, accent, hair length, Genetic - Variation that you are born with e.g. eye colour, blood type, Mutation - A change in your DNA. Causes variation e.g. albinoism, Natural Selection - The way species evolve over time, Continuous Variation - When you can plot the variation on a bell-shaped curve e.g. height, weight, Discontinuous Variation - When there is no pattern to the graph - e.g. blood type, , Identical Twins - These people would show no genetic variation, Sexual Reproduction - Requires two parents. Variation occurs, Asexual reproduction - Requires one parent. No variation occurs, Ionising Radiation - A type of energy or light that causes mutations, Carcinogen - A chemical that can cause mutations,

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