

This high-quality GCSE Biology worksheet focuses on B13 – Variation (AQA Combined Science). It includes a set of three stretch-and-challenge tasks designed to develop deeper understanding of genetic, environmental, and combined causes of variation. These activities move beyond simple recall and require students to apply knowledge, analyse scenarios and explain scientific reasoning using key vocabulary such as phenotype, genes, genetic potential and environmental factors.
Perfect for higher-ability learners, end-of-topic extension work, revision, or challenge tasks in mixed-ability classrooms. Also ideal for home learning, tutoring, or non-specialist delivery, as the worksheet requires no additional resources and includes everything needed.
A complete mark scheme and model answers are provided for teacher use or self/peer assessment, making this a fully ready-to-use resource.
This resource includes:
✔ Challenge Task 1 – Detailed explanation of genetics × environment interaction
✔ Challenge Task 2 – Mutations, phenotype impact and evaluation
✔ Challenge Task 3 – Twin study analysis
✔ Full model answers for all tasks
✔ Clear mark scheme for each section
✔ Suitable for all exam boards (AQA focus)
✔ No prep required – ideal for quick differentiation
Perfect for:
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Stretch & challenge tasks
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Higher-ability or foundation-to-higher bridging
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Homework
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Revision lessons
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Cover work
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Intervention or tutoring
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Peer/self assessment
These resources are designed to minimise printing, allowing teachers to reuse sheets while students complete all tasks in their exercise books or on separate paper.
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