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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance1 Mark
MCQ
If genetic code is tetraplet then what is the possible number of codons which code $20$ types of amino acids?
  • A
    $261$
  • B
    $64$
  • ✓
    $256$
  • D
    $43$
✓

Answer

Correct option: C.
$256$
At any given position in a nucleic acid, there are four possible nucleotides which can occur.
There are two nucleotides containing purine bases and two containing pyrimidine bases.
If the genetic codon is tetraplet, there will be $4 \times 4 \times 4 \times 4$ or $256$ possible codons to code for $20$ amino acids.

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