Introduction to SNP Genotyping: Understanding Genetic Variation and Its Applications Single-nucleotide polymorphisms or SNPs are DNA sequence variations that occur when a single nucleotide — A, T, C, or G — in the genome differs between members of a species or paired chromosomes in an individual. For example, a SNP may replace cytosine (C) with thymine (T) in a specific position in the genome. SNPs are the most common type of genetic variation event among people. No...
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