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Learning objective

Explain genes as DNA base sequences coding for polypeptides or functional RNA.

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Topic

Genetic information official content

Subtopic

DNA, genes and chromosomes

Aqa A Level BiologyGenetic information, variation and relationships between organisms

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Quick explanation

Explain genes as DNA base sequences coding for polypeptides or functional RNA

  • This point belongs to Genetic information official content, especially DNA, genes and chromosomes.
  • You need to be able to explain genes as DNA base sequences coding for polypeptides or functional RNA.
  • The key ideas to know are gene and DNA.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

geneDNA

Why it matters

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

Quick student answer

What is the primary function of a gene?

Direct answer

The primary function of a gene is to code for polypeptides or functional RNA.

Key terms

  • Polypeptide: A polypeptide is a chain of amino acids linked by peptide bonds, which folds into a functional protein.
  • Transcription: Transcription is the process by which the genetic information in DNA is copied into mRNA.

Common trap

Confusing genes with alleles: A gene is a segment of DNA that codes for a trait, while an allele is a variant form of a gene.

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What is the primary function of a gene?

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