A linear piece of DNA that is 30 kb long is first cut with BamHI, then with HpaII, and, finally, with both BamHI and HpaII together. Fragments of the following sizes were obtained from this reaction: BamHI: 20-kb, 6-kb, and 4-kb fragments Hpall: 21-kb and 9-kb fragments BamHI and Hpall: 20-kb, 5-kb, 4-kb, and 1-kb fragments Draw a restriction map of the 30-kb piece of DNA, indicating the locations of the BamHI and HpaII restriction sites
