To assist in these efforts, the Human Genome Project is initiating new studies of genetic variation in the human population to provide a dense map of common DNA variants. DNA sequence variations include insertions and deletions of nucleotides, differences in the copy number of repeated sequences, and single-nucleotide polymorphisms, or SNPs (pronounced “snips”), which occur most frequently throughout the human genome. About 1 in every 300 to 500 bases in human DNA may be a SNP.


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