Erwin Chargaff's first rule states that the amount of adenine in DNA is the same as the amount of thymine, and the amount of guanine is the same amount as cytosine.
His second rule states that DNA composition is not fixed between species, e.g. the adenine-thymine percentage of the human genome is 60% compared to 62% in the yeast genome.
Scientists discovered that in a sample of DNA the % of thymine was 15. What is the % of A, C and G?
A = 15%
A + T = 30%
C + G = 70%
C = 35%
G = 35%
== 30% A/T and 70% C/G
Erwin Chargaff demonstrated the nitrogenous base ratio and relationships (A-T, C-G).
