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Learning objective

Explain the terms homozygous and heterozygous.

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Topic

Reproduction

Subtopic

Genetic inheritance

Aqa Gcse BiologyInheritance, variation and evolution

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Quick explanation

Explain the terms homozygous and heterozygous

  • This point belongs to Reproduction, especially Genetic inheritance.
  • You need to be able to explain the terms homozygous and heterozygous.
  • The key ideas to know are homozygous and heterozygous.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

homozygousheterozygous

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 terms homozygous and heterozygous?

Direct answer

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

Key terms

  • homozygous: In Genetic inheritance, homozygous means the specific Unit 4.6 idea used to answer this objective: students must explain the terms homozygous and heterozygous. 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 homozygous as a vague inheritance word; link it to Reproduction and explain the exact role it plays in AQA GCSE Biology.
  • heterozygous: In Genetic inheritance, the term heterozygous has a specific definition boundary role in Unit 4.6. Use heterozygous when students must explain the terms homozygous and heterozygous. 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 heterozygous 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 homozygous with heterozygous: Clarify that homozygous means both alleles are identical (AA or aa) and heterozygous means the two alleles are different (Aa).

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