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Learning objective

Explain the triplet, degenerate and universal nature of the genetic code.

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Topic

Genetic information official content

Subtopic

DNA and protein synthesis

Aqa A Level BiologyGenetic information, variation and relationships between organisms

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Quick explanation

Explain the triplet, degenerate and universal nature of the genetic code

  • This point belongs to Genetic information official content, especially DNA and protein synthesis.
  • You need to be able to explain the triplet, degenerate and universal nature of the genetic code.
  • The key ideas to know are genetic code.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

genetic code

Why it matters

This objective helps connect DNA and protein synthesis to exam-style questions, flashcards, and revision notes for Genetic information official content.

Quick student answer

Which of the following statements about the genetic code is true?

Direct answer

The genetic code is triplet and universal.

Key terms

  • Codon: A sequence of three nucleotides in mRNA that specifies a particular amino acid or signals the termination of protein synthesis.
  • Degeneracy: The property of the genetic code whereby multiple codons can code for the same amino acid.

Common trap

Confusing codons with amino acids: Remember that while each codon specifies an amino acid, multiple codons can correspond to the same amino acid due to the degeneracy of the genetic code.

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