Its in your genes: human genetic materials(dna) is made up of sequences of the molecules adenosine(a), guanine(g), cytosine(c), and thymine(t), which are called bases. a condon is a sequence of three bases. replications are allowed, so aaa, cgc, and so forth are condons. condons are important because each condon causes a different protein ti be created. what is the probability that the first base is a purine and the second and third are pyrimidines