Biology (Combined Science) · IGCSE · Edexcel · Pearson Edexcel International GCSE Science (Double Award) — Biology (Linear) — 4SD0 · Specification point · 3.26 · Reproduction and inheritance · Inheritance
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| Students should: |
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3.26 understand how the sex of a person is controlled by one pair of chromosomes, XX in a female and XY in a male |