<P> Chargaff 's rules state that DNA from any cell of all 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 . This pattern is found in both strands of the DNA . They were discovered by Austrian born chemist Erwin Chargaff , in the late 1940s . </P>
<P> Chargaff 's rules state that DNA from any cell of all 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 . This pattern is found in both strands of the DNA . They were discovered by Austrian born chemist Erwin Chargaff , in the late 1940s . </P>
who discovered that adenine always matches with thymine
who discovered that adenine always matches with thymine
Austrian born chemist Erwin Chargaff
Austrian born chemist Erwin Chargaff