Y-SNP (Y-Single Nucleotide Polymorphism)

Y-SNP (Y-Chromosome Single Nucleotide Polymorphism) refers to tiny genetic variations—just single DNA building blocks—that occur on the Y chromosome, which is passed from father to son. These variations change one nucleotide (the basic unit of DNA) at a specific position. Because Y-SNPs are stable over generations, they are used to trace paternal lineage and ancestry, helping to identify and categorize paternal genetic groups (haplogroups). This information provides insights into human migration patterns and evolutionary history, making Y-SNPs valuable tools in genetics, genealogy, and population studies.