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Reference.org
SNP array
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<p>In <a href="/facts/Molecular_biology/YgqU35ub">molecular biology</a>, SNP array is a type of <a href="/facts/DNA_microarray/hofkMvou">DNA microarray</a> which is used to detect <a href="/facts/Polymorphism_(biology)/lf32kgfV">polymorphisms</a> within a population. A <a href="/facts/Single_nucleotide_polymorphism/Qy5Y2wom">single nucleotide polymorphism</a> (SNP), a variation at a single site in <a href="/facts/DNA/nB89Iauz">DNA</a>, is the most frequent type of variation in the genome. Around 335 million SNPs have been identified in the <a href="/facts/Human_genome/VTV85pbn">human genome</a>, 15 million of which are present at frequencies of 1% or higher across different populations worldwide. </p>