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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.
It said that DNA was made up of four bases (adenine, thymine, guanine and cytosine) that were present in regular amounts, but that their organisation was too simple to carry hereditary information. It was Chargaff's work that overturned this.rwin Chargaff. Erwin Chargaff was working at Columbia University in New York in the 1940s when he read Oswald Avery's research about DNA being the hereditary material. From that moment in 1944 he devoted his research to working out the chemical composition of DNA.