This is the foundation for dna replication, the rule that states the purine adenine (
a. always pairs with the pyrimidine thymine (t) and the pyrimidine cytosine (
c. always pairs with the purine guanine (
g.
The statement above is called the baise pairing rules for DNA. It is governed by the complementary base pairs which are A-T and C-G. These letters represent the four bases found in DNA which are adenine, thymine, cytosine and guanine.