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The Genetic Code

  • The genetic code is a triplet code. A sequence of three bases (codons) code for one amino-acid. A sequence of codons ensure amino-acids are assembled in the correct order to make a polypeptide.
  • The genetic code is degenerate. Most amino-acids are represented by more than one codon.
  • The genetic code is non-overlapping.
  • The genetic code is almost universal. With a few exceptions the same codons code for the same amino acids in all organisms.
  • Three codons do not code for any amino-acid and are stop codons in DNA: TAG TAA TGA.

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Specification: AQA Biology (7402), A-level, 3.8.1 Alteration of the sequence of bases in DNA can alter the. Topic: Genetics and Variation.

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