Variation AS Unit 2

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daisymadgwick
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For AS level Unit 2 AQA Exam Board
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Variation AS Unit 2
1 Variation exists between all individuals:
1.1 INTERSPECIFIC: Variation that exists between different species e.g Horses vary from Ducks
1.2 INTRASPECIFIC: Differences that occur within a species e.g lenths of giraffes necks
2 INTRASPECIFIC is caused by genetic and enviromental factors
2.1 Genetic
2.1.1 Same Genes = Same species
2.1.2 Different versions of those genes are called alleles
2.1.3 The alleles an organism that has make up its GENOTYPE
2.1.4 Different genotype = variation in phenotype (characteristcs
2.1.5 You inherit from parents specific factors e.g eye colour
2.2 Enviromental
2.2.1 Phenotype affected by enviroment.
2.2.2 Fur colour
2.2.3 Plant Growth
3 Investigating Variation
3.1 Usally you take a sample of a population not whole thing because it is impossible and time consuming
3.2 Random Sample
3.2.1 Diving field in to a grid and use random generator
3.3 Standard Deviation
3.3.1 Tells you how much of the values in a single sample vary.
3.3.2 Large SD = Vary alot!
3.3.3 Small SD: Vary alittle around mean value

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