DNA Fingerprinting A. What is an RFLP and where are they located within a gene? B. Why are RFLPs useful for DNA Fingerprinting? C. What is an STR and why would using STRs be useful in DNA Fingerprinting?

DNA of different densities is distinguished by a procedure called caesium chloride (CsCI) densitycentrifugation. Spinning CsCI at high speeds for many hours generates a gradient of caesium andchloride ions. The highest ion concentration, or density, occurs at the bottom of the tube.b. In this experiment, where on the cesium chloride (CsCI) gradient would the following DNAbe found (low density, middle density, or high density):Double stranded DNA where both strands are labeledDouble stranded DNA where one strand is labeledDouble stranded DNA where neither strand is labeled