What is Single-Nucleotide Polymorphism?

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Single-nucleotide polymorphisms (SNPs) are variations of single base pairs in the human genome, serving as key indicators of genetic diversity. Approximately 1.8 million SNPs have been identified, with SNPs constituting about 90% of all human genetic variation. These variations are primarily found in non-coding regions, often referred to as "junk DNA," since only 3-5% of human DNA is coding. A variation qualifies as a SNP if it occurs in at least 1% of a population, making them valuable markers for gene mapping studies.
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What is is single-nucleotide polymorphism ?
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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.

http://www.geneed.com/glossary/s/index.html
 
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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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