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Learning objective

Explain that different forms of a gene are called alleles.

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Topic

Reproduction

Subtopic

Genetic inheritance

Aqa Gcse BiologyInheritance, variation and evolution

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Quick explanation

Explain that different forms of a gene are called alleles

  • This point belongs to Reproduction, especially Genetic inheritance.
  • You need to be able to explain that different forms of a gene are called alleles.
  • The key ideas to know are gene and allele.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

geneallele

Why it matters

This objective helps connect Genetic inheritance to exam-style questions, flashcards, and revision notes for Reproduction.

Quick student answer

How do you explain different forms of a gene are called alleles?

Direct answer

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

Key terms

  • Allele: In Genetic inheritance, Allele means the specific Unit 4.6 idea used to answer this objective: students must explain that different forms of a gene are called alleles. 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 Allele as a vague inheritance word; link it to Reproduction and explain the exact role it plays in AQA GCSE Biology.
  • Gene: In Genetic inheritance, the term Gene has a specific definition boundary role in Unit 4.6. Use Gene when students must explain that different forms of a gene are called alleles. 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 or as a synonym for a neighbouring term; link it to Reproduction, Genetic inheritance, and the exact role it plays in AQA GCSE Biology. Revision cue 1: When asking about DNA, test molecular structure, base sequence, nucleotides, or genetic information storage.

Common trap

Confusing alleles with genes: Explain that a gene is a specific location on a chromosome that can exist in different forms (alleles). Clarify that each individual carries two alleles for a gene (one from each parent) and that the set of all possible alleles for a gene is called the allele pool. Use examples such as the gene for flower colour in pea plants having alleles for purple, white, and pink to illustrate the concept.

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