Variation
- Created by: Rebecca
- Created on: 01-04-13 18:07
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There are two types of variation:
Interspecific Variation - the variation that exists between different species
Intraspecifc Variation - the variation that exists bewteen individuals of the same species
Causes of Variation
Genetic Differences
-
- due to the genes an organism possesses
- different species may have different genes
- members of the same species have the same genes but different alleles
- the alleles of an organism make up its genotype
- different genotypes result in variation of the phenotype
- due to the genes an organism possesses
1. Mutations:
e.g. a change in the order of amino acids in a peptide chain
- this change may be passed on to the next generation
2. Meiosis:
e.g. the formation of gametes
- genetic material is mixed up before passing to the gametes to make sure they are all different.
3. Fusion of Gametes:
e.g. fertilisation
- which gametes fuse is random
- half the genetic material is from the mother, half from the…
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