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A SNP, or Single Nucleotide Polymorphism, is a change in your Y-DNA sequence at a location other than those in the 12, 25, 37, and 67 marker tests. SNPS are unique to specific haplogroups so SNP tests such as the Backbone and Deep SNP tests are used to identify haplogroups and their subclades respectively. Haplogroups, defined by SNP’s are the bra …
