Đoạn 1:
A + T / G + X = 1/2 -> A/G = 1/2
2A + 2G = 600
-> A = T = 100 nu, G = X = 200 nu
H = 2A + 3G = 800 lk
Đoạn 2:
A + T / G + X = 1 -> A/G = 1
2A + 2G = 600
-> A = T = 150 nu, G = X = 150 nu
H = 2A + 3G = 750 lk
Đoạn 3:
A + T / G + X = 2/3 -> A/G = 2/3
2A + 2G = 600
-> A = T = 120 nu, G = X = 180 nu
H = 2A + 3G = 780 lk