Electropherogram | DNA Testing Glossary
An electropherogram is the graphical output produced by a genetic analyzer during STR analysis. It displays a series of colored peaks, where each peak represents a detected DNA fragment (allele) at a specific locus. The position of the peak along the horizontal axis indicates the size of the fragment (measured in base pairs), and the height of the peak reflects the amount of that fragment in the sample. Scientists use electropherograms to read a person's DNA profile — identifying which alleles are present at each tested locus. The electropherogram is the raw data behind every DNA relationship test result, and a qualified analyst reviews it before any report is finalized.
Related Terms
STR (Short Tandem Repeat), Allele, DNA Profile, Locus, Genetic Marker
