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Learning objective

Define a gene as a small section of DNA on a chromosome.

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Topic

Reproduction

Subtopic

DNA and the genome

Aqa Gcse BiologyInheritance, variation and evolution

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Quick explanation

Define a gene as a small section of DNA on a chromosome

  • This point belongs to Reproduction, especially DNA and the genome.
  • You need to be able to define a gene as a small section of DNA on a chromosome.
  • The key ideas to know are chromosome, 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

chromosomegeneDNA

Why it matters

This objective helps connect DNA and the genome to exam-style questions, flashcards, and revision notes for Reproduction.

Quick student answer

What is a gene?

Direct answer

In Biology, this page helps you answer questions about a gene within Reproduction. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are gene and chromosome.

Key terms

  • gene: In DNA and the genome, gene means the specific Unit 4.6 idea used to answer this objective: students must define a gene as a small section of DNA on a chromosome. Keep the term curriculum-specific by applying this boundary: DNA is the molecule; a gene is a functional section of that molecule. Do not use gene as a vague inheritance word; link it to Reproduction and explain the exact role it plays in AQA GCSE Biology.
  • chromosome: A chromosome is a structure within the cell nucleus that contains DNA and carries genetic information.

Common trap

Misunderstanding the Definition of a Gene: Emphasize that a gene is a specific segment of DNA located on a chromosome, and clarify the distinction between the two terms.

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