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Firstly, DNA is transcripted to mRNA, which is then translated by ribosomes into your polypeptide.

Each set of 3 bases on the mRNA (codon) codes for a particular amino acid. However, there can be up to four codons, coding for a single amino acid. ie GCU, GCC, GCA and GCG all code for Alanine.

Therefore, if you know the amino acid sequence, you can work backwards to mRNA and then to DNA, but you wouldn't be very accurate as you'd need to guess the codons.

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16y ago

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