Q. 12. 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 phenomenon.
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 obtaine, e.g., lle (Isoleucine) has three codons AUU, AUC, AUA. Hence, a dipeptide Met-lle can have the following nucleotide sequence.
(i) AUG-AUU (ii) AUG-AUC (iii) AUG-AUA
And if, we deduce amino acid sequence from the above nucleotide sequences, all the three will code for Met-lle.
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