Question

The following ratio is generally constant for a given species:

• A. A+G/T+C
• B. G+C/A+T
• C. A+C/T+G
• D. None of the above

Answer 1

The correct option is A A+G/T+C

Chargaff's rule states that DNA from any cell of an organism should have a 1:1 ratio of Purines : Pyramidines (based on the base pair rule). This means that the amount of guanine is equal to cytosine and the amount of adenine is equal to thymine.
Purines : Pyramidines
Purines / Pyramidines = 1
(A + G) / (T + C) = 1