Single Nucleotide Polymorphism, a variation in a single DNA building block that occurs when one nucleotide is substituted for another.
Scientific acronym coined in the 1980s-90s as genetics advanced. Combines 'single' (one), 'nucleotide' (DNA building block from Latin nucleus + -ide), and 'polymorphism' (from Greek meaning 'many forms').
SNPs are like typos in the book of life - tiny differences that can determine whether you're likely to have blue eyes, lactose intolerance, or predisposition to certain diseases. About 99.9% of human DNA is identical, but that 0.1% difference amounts to about 3 million SNPs per person.
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