Originally posted by M.B.
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1. International Society of Genetic Genealogists
See the Newbie section there, including the Glossary, where they have these definitions:
- Single-nucleotide polymorphism (SNP): (pronounced snip) A SNP test confirms your haplogroup by determining if a SNP has mutated from its derived or ancestral state. A SNP is usually found on a different area of the Y-chromosome than where the Y-STR markers are. Sometimes, a SNP may cause a null result on a marker.
- Short tandem repeat: Patterns in the DNA sequence which repeat over and over again in tandem, i.e., right after each other. Typically the repeat motif is less than six base pairs long. By counting the repeats, one gets an allele value which is given in an individual's haplotype. STRs are also known as microsatellites and simple sequence repeats (SSRs).
2. Another good site to learn is the "Beginner's Guide to Genetic Genealogy," by Kelly Wheaton. See Lessons 3 and 4 on Exploring the Y.
Oops, I see that Mr. Barry beat me posting to the latter site.
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