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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance1 Mark
MCQ
The number of triplet codons having all the three bases same in 64 triplet codons is:
  • A
    2
  • B
    4
  • C
    6
  • D
    8
✓

Answer

  1. 4

Explanation:

Three is the minimum number of nucleotides per codon needed to encode 20 amino acids. 20 amino acids are encoded by combinations of 3 nucleotides. If a codon were two nucleotides, the set of all combinations could encode only. 4 × 4= 16 amino acids. With three nucleotides, the set of all combinations can encode. 4 × 4 × 4 = 64 amino acids i.e., 64 different combinations of four nucleotides taken three at a time.

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