Revision notes.

Try this with Biology

1. Close your notes and write the main idea in two sentences from memory.
2. Reopen the source and correct the first mistake or omission you find.
3. Add one example and one question to test whether you can apply the idea.

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Topics in the resource inventory

• Continuity through binary fission, mitosis, meiosis and fertilisation
• DNA organisation, nucleotide pairing and semi-conservative replication
• Genes, the triplet code, transcription, translation and protein function
• Gene–environment effects, mutation and sources of genetic variation
• Dominant, recessive and autosomal inheritance with Punnett probabilities
• Co-dominance, incomplete dominance, sex linkage, multiple alleles and polygenes
• Pedigrees, genotype inference and future-generation probability
• PCR, gel electrophoresis, sequencing, DNA profiling and recombinant DNA
• Transgenic organisms: applications, environmental risks and evidence-based decisions
• Evidence for evolution and constructing and interpreting phylogenetic trees
• Dynamic gene pools: mutation, natural selection, drift, founder effect and gene flow
• Microevolution, allopatric speciation, artificial selection and conserving viable gene pools
• Stimulus–response models, tolerance limits and negative feedback
• Heat exchange and thermoregulation in endotherms and ectotherms
• Nitrogenous wastes and animal water and salt balance
• Xerophyte and halophyte adaptations for water balance and gas exchange
• Pathogen groups, structural distinctions and the syllabus disease examples
• Pathogen life cycles, host invasion, zoonoses and transmission pathways
• Population density, movement, climate, vectors and epidemic modelling
• Quarantine, herd immunity, physical controls, antibiotics, antivirals and resistance