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Learning objective

Describe polydactyly as an inherited disorder caused by a dominant allele.

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Topic

Reproduction

Subtopic

Inherited disorders

Aqa Gcse BiologyInheritance, variation and evolution

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Quick explanation

Describe polydactyly as an inherited disorder caused by a dominant allele

  • This point belongs to Reproduction, especially Inherited disorders.
  • You need to be able to describe polydactyly as an inherited disorder caused by a dominant allele.
  • The key ideas to know are dominant allele and polydactyly.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

dominant allelepolydactyly

Why it matters

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

Quick student answer

How does polydactyly work?

Direct answer

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

Key terms

  • polydactyly: In Inherited disorders, polydactyly means the specific Unit 4.6 idea used to answer this objective: students must describe polydactyly as an inherited disorder caused by a dominant allele. 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 polydactyly as a vague inheritance word; link it to Reproduction and explain the exact role it plays in AQA GCSE Biology.
  • dominant allele: A gene variant that is expressed in the phenotype even when only one copy is present.

Common trap

Understanding Polydactyly: Remember that polydactyly is expressed when at least one dominant allele is present. Review examples of dominant and recessive traits to clarify this distinction.

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