In sequences that code for tRNA in the homeotic genes in the mitochondrial DNA in single nucleotide-polymorphisms .
In DNA sequence the variation that occurs when a single nucleotide in the genome sequence is altered and the particular alteration is present in at least 1% of the population.
SNPs are said to be found in the DNA between genes. They are also known as biological markers, that helps scientists locate genes that are associated with disease. Hence, when SNPs occur within a gene or in a regulatory region near a gene, they may cause a more direct effect in disease by altering the gene's function.
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