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Chargaffs rule. in dna the number of adenine units equals the number of thymine units; likewise, the number of guanine units equals the number of cytosine units.
In 1952, their experiments showed that ______ is the genetic material instead of ____________. [pic]. 5. Erwin Chargaff: http://www.dnai.org/timeline/index.html. Watch âChargaffâs Ratios.â Chargaff used relative proportions of bases in DNA to come up with his rules for base pairing.. Friedrich (Fritz) Miescher http://www.dnai.org/timeline/index.html Find Miescher on the timeline and click on the bucket with the Red Cross to watch the animation. In 1869, he extracted a substance from white blood cells that he called nuclein.