Techniques of DNA Analysis

Figure 13.1. The reappearance of wrinkled peas in the second generation meant that the information (gene or deoxyribonucleic acid [DNA]) to produce wrinkles was present in the first generation plants but was not expressed. Since it was expressed in the second generation plants, the DNA was transmitted unchanged. The genetic information was shown to be particulate rather than fluid. It is the particulate, unchanging nature of the DNA molecule that allows DNA fingerprinting.