Problem 2

Background and context

• Chargaff discovered that, contrary to popular thought, each species has its own proportion of each nucleotide type
• The amounts of A, T, G, and C in DNA vary from species to species.
• In each species, the amounts of A and T are equal (A = T), as are the amounts of G and C (G = C).
• Chargaff’s data suggest that DNA has a means to be stable, in that A can pair only with T and G can pair only with C.