alleryIn humans, the percentage of A in a DNA sample is 30 %. By Chargaff's rule, the percentage of G is
A30 %
B40 %
C20 %
D50 %
Answer & Solution
Correct answer: C. 20 %
1. Chargaff's rule: A = T and G = C; total A+T+G+C = 100 %.
2. Given A = 30 %, T = 30 %. Remaining for G + C = 40 %.
3. Since G = C, each is 20 %.
_Source: Maharashtra Balbharati Std XII Biology, Ch 4 "Molecular Basis of Inheritance" §4.3_
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