SNP Genotyping Arrays and Tag SNP Selection

Explains why a GWAS hit is often a tag rather than the causal site, before the student meets LD formally.

Questions this Concept answers

Why do genotyping arrays measure only a subset of genome variants rather than every possible site?

jeremy Text

Tag SNP - Wikipedia

A tag SNP is one representative variant chosen to stand in for a whole haplotype block of variants that are inherited together because of linkage disequilibrium. The page explains how LD arises and d…