Chargaff's rules state that DNA from any cell of any organisms should have a 1:1 ratio (base Pair Rule) of pyrimidine and purine bases and, more specifically, that the amount of guanine should be equal to cytosine and the amount of adenine should be equal to thymine.
Answer:
The rule simply points out that in DNA, Pyrimidine will bond with Purines; and so the Adenine-Thymine,
Guanine-Cytosine bonding is none, ergo, A = T, and G = C. It is a little wordier than that, but the idea should be the same.
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