Based on the following information, answer the questions given below:
The technique of DNA Fingerprinting was initially developed by Alec Jeffreys. He used a satellite DNA as probe that shows very high degree of polymorphism. It was called as Variable Number of Tandem Repeats (VNTR). The technique, as used earlier, involved Southern blot hybridisation using radiolabelled VNTR as a probe. It included
• isolation of DNA, 
• digestion of DNA by restriction endonucleases, 
• separation of DNA fragments by electrophoresis, 
• transferring of separated DNA fragments to synthetic membranes, such as nitrocellulose or nylon, 
• hybridisation using labelled VNTR probe, and 
• detection of hybridised DNA fragments by autoradiography.