What are SNPs?

SNP stands for single nucleotide polymorphism (SNP), a DNA sequence variation of one nucleotide (A, T, G or C) that differs in the genome of representatives of the same species or between paired chromosomes.

For example, if two DNA sequences – AAGCCTA and AAGCTTA – differ by a single nucleotide, then there are two alleles: C and T. Such point mutations are considered single nucleotide polymorphisms (SNPs).