Molecular Basis of Inheritance Question 29

29. In a DNA percentage of thymine is $20 %$ then what will be the percentage of guanine?[2002]

(a) $20 %$

(c) $30 %$

(b) $40 %$

(d) $60 %$

Show Answer

Answer : c

Hints & Solution

(c) According to Chargaff’s rule, the ratio of purine bases to pyrimidine bases is equal. $A=T, C=G$. If $T$ is $20 %$ then $A$ is $20 %$ and $C$ and $G$ are $30 %, 30 %$.



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