In a given DNA molecule, if the amount of thymine is 35% what will be the % of adenine. Options are – i. 15% ii. 30%            iii. 35%            iv. 20%

According to Chargaff’s rule the ratio of Purines : Pyrimidines in a double stranded DNA, is a constant for a given species .This ratio can help identify sps & source of DNA ,also helps in classification

A = T

C= G

But A+T need not be equal to C+G

So if T = 35% then A is also 35%