NEET Botany Molecular Basis of Inheritance Questions Solved


In one polynucleotide chain of a DNA molecule the ratio of A + T / G + C is 0.3. What is the A + G / T + C ratio of the entire DNA molecule:

(a) 0.3                  (b) 0.6                  (c) 1.2                  (d) 1

In dsDNA, A = T and G = C

 

A + T / G + C = 0.3

2A/2G = 0.3

A = 0.3 X G ----(i)

 

Also, (A + T) + (G + C) = 100 ---(ii)

Substituting all amino acids in terms of G :-

0.3G + 0.3G + G + G = 100

2.6G = 100

G = 38.5 = C

 

From (i)

A = T = 0.3G = 11.55

 

A + G / T + C = 11.55 + 38.5 / 38.5 + 11.55 = 1

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