Specification references covered: B4.11 [H] (main stages of genetic engineering: restriction enzymes, ligase, sticky ends, vectors), B4.14 (evaluate benefits and risks of genetic engineering and selective breeding)

The Topic Mastery Sheet walks through the full genetic engineering process step by step - from isolating the desired gene through to mass production in bacteria - with clear definitions of restriction enzyme, sticky ends, ligase, and vector. A complete benefits and risks table covers both genetic engineering and selective breeding side by side, and a model evaluation paragraph (Golden Rice) demonstrates the balanced-argument style required for extended writing.

The Student Exam Practice Sheet (20 marks) is built from the official Edexcel Higher exam question on genetically-engineered insulin production - including the exact restriction enzyme/ligase question and the full 6-mark benefits-and-risks evaluation question with the official Level descriptor rubric - plus additional practice on GMOs, sticky ends, marker genes, and ethical considerations.

The Teacher Answer Key reproduces the official mark scheme exactly, including the full AO2/AO3 indicative content for the 6-mark evaluation question and the specific guidance that “scissors”/“glue” used informally should be ignored rather than penalised.

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