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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance2 Marks
Question
There is only one possible sequence of amino acids when deduced from a given nucleotides. But multiple nucleotides sequence can be deduced from a single amino acid sequence. Explain this phenomena
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Answer

Some amino acids are coded by more than one codon (known as degeneracy of codons), hence on deducing a nucleotide sequence from an amino acid sequence, multiple nucleotide sequence will be obtained. For e.g., Ile has three codous: AUU, AUC, AUA hence a depeptide Met–Ile can have the following nucleotide sequence:
  1. AUG – AUU.
  2. AUG – AUC.
  3. AUG – AUA.
And if, we deduce amino acid sequence the above nucleotide sequences, all the three will code for Met–Ile.

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