If you've read any of the many stories lately about Craig Venter or Jim Watson's genome, you've probably seen a "SNP" appear somewhere. You may be wondering, and rightly so: just what is a SNP?

Never fear, hopefully this post will answer some of those questions.

SNP stands for Single Nucleotide Polymorphism. That's a mouthful. It means some people, will have one base at a certain position, in a sequence of bases, and other people will have a different base at that position. The two forms of SNP are called "alleles." (Usually there are two forms, but that's ... Read more

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