3C.2 Interactions between genes and the environment

Pearson Edexcel International A Level Biology Teaching Resource (WBI12)

• Designed for: Pearson Edexcel International A Level Biology
• Covers: Unit 2: Cells, Development, Biodiversity and Conservation (WBI12)
• Aligned with specification point: 3C.2 – Interactions Between Genes and the Environment

This teaching resource includes clear lesson slides, real-world case studies, and student-friendly summaries explaining how environmental factors interact with the genome to influence phenotypic expression and continuous variation.

Designed to support both teachers and students, this resource helps learners master the distinction between polygenic inheritance and environmental influences, epigenetic regulation (DNA methylation and histone modification), and classic specification examples such as animal hair color changes (e.g., Himalayan rabbits/Siamese cats), human height, and plant growth in varying light or nutrient conditions. Ideal for classroom teaching, revision, independent study, and exam preparation.

Includes:

• Step-by-step mechanisms of gene-environment interactions and phenotypic plasticity
• Detailed breakdowns of polygenic inheritance vs. environmental impacts
• Clear summaries of epigenetic mechanisms (DNA methylation and histone acetylation)
• Classic exam case studies (e.g., temperature-dependent gene expression, fur coloration, height variance)
• High-yield diagrams, key vocabulary, and exam-focused tips on mark scheme terminology
• Fully aligned Pearson Edexcel International A Level material

Perfect for: A Level Biology lessons, revision sessions, tutoring, homework support, and exam prep.