Single-nucleotide Polymorphisms
Single-nucleotide polymorphisms (SNPs) are tiny genetic variations at a single DNA position that help explain differences in traits like skin, hair, and eye color. They are common natural variations, not harmful mutations.
See also: Single Nucleotide Polymorphisms
Single-nucleotide polymorphisms (SNPs) are the most common type of genetic variation among people, representing a change in a single DNA building at a specific position. They occur frequently in the human genome and are used as markers to study traits, diseases, and ancestry. Unlike mutations, SNPs are typically benign and do not cause disease, though they can influence susceptibility to certain conditions.
What this means in real life
Two people might have the DNA sequence AAGC at a particular spot, while a third person has AAGC at that same location—that single letter difference is a single-nucleotide polymorphism, like how some people have blue eyes and others brown due to genetic variants.
What it isn’t
Not a mutation or disease-causing error. Most are harmless natural variations present in healthy populations, not rare defects. A polymorphism is common by definition; a mutation is typically rare or novel.
Commonly misused online
Often conflated with 'genetic mutations' or treated as inherently harmful. Social media posts frequently imply a SNP automatically increases disease risk, ignoring that most are neutral and only some correlate with health outcomes.