Manhattan plot

Content sourced from Wikipedia, licensed under CC BY-SA 3.0.

A Manhattan plot is a graph used in genome-wide association studies (GWAS) to show many genetic variants called SNPs. The x-axis shows genomic position (usually grouped by chromosome and colored by chromosome). The y-axis shows the strength of association with the trait, as the negative logarithm base 10 of the p-value (-log10(p)); higher values mean stronger evidence. Each dot represents one SNP. The plot often looks like a skyline: most points are low, but a few tall points stand out where the strongest associations are found. Colors help tell different chromosomes apart.