Specification references covered: µþ3.20²¹â€“B3.20²ú (genetic variation; environmental variation; continuous vs discontinuous variation; statistical measures; normal distribution)

This pack prepares students for both the data-handling (range, mode, normal distribution) and extended writing dimensions.

The Topic Mastery Sheet provides a comprehensive causes-of-variation table distinguishing genetic, environmental, and combined causes; a continuous vs discontinuous comparison with correct graph type guidance; a normal distribution explanation with statistical measures; the official mark scheme values for the Begonia leaf data; and the complete Level 3 indicative content for the 6-mark sheep variation question.

The Student Exam Practice Sheet (20 marks) covers: leaf range and mode, variation type classification, two-reason explanation, characteristic classification table, discontinuous identification, normal distribution naming, leaf variation assessment, and the full 6-mark Level of Response question with descriptor rubric.

The Teacher Answer Key gives the official indicative content at all three levels and flags the most common partial-credit error (leaf variation described as ‘genetic only’ when both is required).

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