BRAINCAKEThe 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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More in Genetics and Variation
- Mutations
- Effects of Mutations
- Change in Protein Function
- Sickle-cell Anaemia
- Causes of mutations
- Chromosome Mutations
- Gene Regulation
- Controlling Transcription
All 36 lessons in Genetics and Variation · All OCR A-level Biology topics