What is is single-nucleotide polymorphism ?
Variations of single base pairs scattered throughout the human genome that serve as measures of the genetic diversity in humans. About 1 million SNPs are estimated to be present in the human genome, and SNPs are useful markers for gene mapping studies.
When you say a million in the genome, does that include ones in the so-called junk DNA?
That would mainly include junk DNA since only 3-5% of our DNA is coding. A variation is only considered a SNP if it occurs in at least 1% of a population. SNPs make up 90% of all human genetic variation. Actually nearly 1.8 million SNPs have been characterized by the SNP consortium :)
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