A codon that specifies leucine undergoes a single-base substitution, producing a new codon that specifies methionine. The codons that specify leucine are UUA, UUG, CUU, CUC, CUA, and CUG. The only codon that specifies methionine is AUG. Which of the following correctly describes the mutation?A transition at the third nucleotide position of a leucine codonA transversion at the first nucleotide position of a leucine codonA transversion at the third nucleotide position of a leucine codonA transition at the first nucleotide position of one of the leucine codonsA transversion at the second nucleotide position on a leucine codon

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