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Chargaff's rule states that: A + G = T + C
Where A = Adenine, G = Guanine, C = Cytosine, and T = Thymine Also, G = C and A = T Some people discuss the G + C content of DNA. This refers to the amount of G + C relative to A + T. They use a simple variation of Chargaff's rule to show that: G + C
A + T If G + C is equal to A + T then the ration is 1. If there is a higher G + C content of the species, it will be greater than 1. If there is a lower G + C content of the species, it will be less than 1.

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