Biology
DNA and genes practice
Inheritance, Variation and Evolution training and original diagnostic questions for Paper 2.
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DNA and genes practice
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Make it concrete
Analogy
DNA and genes is like a living system solving a small survival problem: each part has a job, and the answer depends on how those jobs connect.
Why now: An analogy helps when the definition feels abstract.
Do this: Match each part of the analogy to the science idea.
Why it matters
Real-world use
DNA and genes helps explain health, ecosystems, medicine and how organisms stay alive. Example: Human body cells usually contain 23 pairs of chromosomes.
Why now: Real examples make the mark-scheme words easier to remember.
Do this: Connect one key word to the example.
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