MODEL RELEASED. DNA autoradiogram. Scientist examining a DNA (deoxyribonucleic acid) autoradiogram. In this case, the autoradiogram is the visual record of a polymerase chain reaction (PCR) analysis of DNA samples. PCR is a technique in which DNA is amplified from minute starting amounts. Each band on the autoradiogram represents a fragment of amplified DNA. DNA is the genetic material containing the instructions necessary for the development and functioning of all living organisms.