DNA fingerprinting gel: crime scene and three suspects

An example figure from the Gel Electrophoresis generator.

A glowing agarose gel with five lanes labeled Ladder, Crime scene, Suspect 1, Suspect 2 and Suspect 3; the 1 kb ladder is labeled from 10,000 bp down to 500 bp, and each other lane has four bands — A 1% agarose gel with glowing bands on a dark background, as a stained gel looks under UV light. The first lane is a 1 kb ladder with its sizes written beside it, from 10,000 bp to 500 bp; the next holds DNA from a crime scene, and the last three hold DNA from three suspects, four bands each. Students compare each suspect’s bands with the crime scene’s to decide which one matches.

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Answer key

Crime scene: 5200, 3100, 1800, 900 bp
Suspect 1: 6000, 3100, 1500, 700 bp
Suspect 2: 5200, 3100, 1800, 900 bp
Suspect 3: 4200, 2400, 1800, 1100 bp

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