Specification references covered: µþ3.19–B3.23 (multiple gene traits; mutation definition and causes; Human Genome Project; genetic variation; effects of mutations on phenotype)

The Topic Mastery Sheet tackles both directly: a two-part mutation definition table matching the official 2-mark mark scheme structure, a three-level effect classification, a worked explanation of why most mutations are neutral, a complete Human Genome Project section with all accepted medical applications, and a multi-gene traits list with specific named examples.

The Student Exam Practice Sheet (20 marks) covers: genome definition, genome benefits, mutation naming, 2-mark mutation description, achondroplasia explanation, mutation causes, phenotypic effect explanation, multi-gene example, heterozygous term, genome application, population variation explanation, continuous variation type, leaf variation assessment, and mutation neutrality explanation.

The Teacher Answer Key includes the exact wording accepted and rejected for each question.

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