Single nucleotide polymorphism abundance

Single Nucleotide Polymorphisms (SNPs) are single base pair positions in genomic DNA at which normal individuals in a given population show different sequence alternatives (alleles) with the least frequent allele having an abundance of 1% or greater. SNPs occur once every 100-300 bases and are hence the most common genetic variations. 

With the recent automation and miniaturization of DNA typing methods, the analysis of polymorphism began to revisit the single nucleotide polymorphism analysis (SNPs), another form of loci polymorphism. They were first described about in the 1980s, but only recently are being studied for paternity analysis. They are abundant in the genome and perceived as being more stable than STRs due to lower mutation rates. 

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