Sometimes, the presence of an SNP in a gene disrupts a gene function. Hence, SNPs lead to one base pair change in the DNA. The SNPs effectively serve as markers. Some references point out the comparison of the SNPs with the point mutations. They arise due to the alteration in the sequence of the DNA. It involves a single nucleotide base change, insertion or a deletion. However, the SNPs and point mutations differ only in their frequencies. Point mutations arise as a result of the occurrence of 1% or less than 1% of the variation in a population. Hence, the low-frequency mutations do not serve as good markers. The SNPs occur in the various regions in a genome. Different SNPs exist in the coding as well as the non-coding regions in a genome. The coding regions, also known as exons, code for the specific amino acids. The non-coding regions, known as the introns, do not get involved in coding and hence get spliced out before the translation occurs.