For Genome Wide Association Studies (GWAS), variants present in the tested groups (patients and controls) can be identified using SNP arrays (often called bead arrays, high density arrays, microarrays or similar). Describe how these arrays can be used to characterise up to 1 million SNPs (Single Nucleotide Polymorphisms) in a single individual in a single experiment. Describe how the method works – that is, how the base present at each potential polymorphic site can be identified
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