1. The problem statement, all variables and given/known data The question: Scientists need to take precautions when they carry out restriction mapping. They need to make sure that the enzyme they have used has completely digested the DNA. One check they may carry out is to add the sizes of the fragments together. How could scientists use this information to show that the DNA has not been completely digested? 2. Relevant equations 3. The attempt at a solution I know that it would be indicative of a partial digest if the sum of the fragments was greater than the size of the original fragment, but I don't understand why it would be so?