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Rutherfordium is a chemical element with symbol Rf and atomic number 104, named in honor of physicist Ernest Rutherford.
1980s â RFLP DNA Testing. After the DNA structure was discovered in 1953, a technique to test DNA was developed called restriction fragment length polymorphism (RFLP) in the mid 1980s. We all inherit our DNA equally from both parents and everyoneâs DNA is different except for identical twins.