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A2 Biology Help

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Can someone please explain what i need to know about the Hardy–Weinberg principle?
I'm not sure what it is and what all i need to know for my A2 exam in summer 2016...

The syllabus says:
explain how selection, the founder effect and genetic drift may affect allele frequencies in populations
use the Hardy–Weinberg principle to calculate allele, genotype and phenotype frequencies in populations and explain situations when this principle does not apply

So if someone could please give me notes to cover up what the syllabus wants please? :)
 
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