NEET Botany Molecular Basis of Inheritance Questions Solved

Suppose, evolution on earth had occurred in such a way that there are 96 amino acids instead of 20. DNA has 12 different types of bases and DNA synthesis occurs in the same way as today. The minimum number of bases per DNA codon would be

(1) 12

(2) 8

(3) 2

(4) 3

(3) If one base is coding one amino acid then (12)1 = 12, but we have 96 amino acids. Suppose two bases form one codon, then (12)2 = 144. It is sufficient to code 96 or 20 amino acids and hence two, bases form one codon.

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