GCSE Biology
Inheritance and ecology
revision.
DNA, genetic diagrams, variation, natural selection, ecosystems and human impact.
Inheritance and ecology guides
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Students type: decay microorganisms compost GCSE Biology
Open guide Revision guideQuadrats and samplingStudents type: quadrat random sampling GCSE Biology
Open guide Revision guideBiodiversityStudents type: biodiversity definition GCSE Biology
Open guide Revision guideThe carbon cycleStudents type: carbon cycle photosynthesis respiration GCSE
Open guide Revision guideFood chains and biomassStudents type: food chain arrows producer consumer GCSE
Open guide Revision guideGenetic engineeringStudents type: genetic engineering insulin plasmid restriction ligase
Open guide Revision guideNatural selectionStudents type: natural selection sequence GCSE Biology
Open guide Revision guideVariation and mutationStudents type: mutation definition GCSE Biology DNA
Open guide Revision guideInherited disordersStudents type: cystic fibrosis Punnett square carriers GCSE
Open guide Revision guideGenetic diagramsStudents type: Punnett square heterozygous cross GCSE
Open guide Revision guideDNA, genes and chromosomesStudents type: gene allele chromosome DNA GCSE Biology
Open guide Revision guideEcologyStudents type: quadrat random sampling GCSE
Open guideInheritance, variation and evolution
DNA, genes and alleles, Punnett squares, sex determination, meiosis, mutation and natural selection.
Ecology
Competition, adaptations, food chains, quadrats and transects, the carbon cycle, biodiversity and human impact.
DNA, genes and chromosomes
Define DNA, gene and chromosome for GCSE Biology: double helix, a gene coding for a protein, 23 pairs in humans, and why alleles are versions of a gene rather than “the gene for brown”.
Genetic diagrams
Draw Punnett squares for GCSE Biology: parental genotypes, gametes, offspring ratios, 3:1 and 1:1 crosses, XX × XY sex determination, and why a 25% chance is not a promise about one baby.
Inherited disorders
Apply Punnett squares to GCSE Biology inherited disorders: cystic fibrosis as recessive, polydactyly as dominant, embryo screening, and the ethical arguments mark schemes expect in Combined and Triple.
Variation and mutation
Separate genetic and environmental variation for GCSE Biology: meiosis, fertilisation, mutation as a DNA change, and why most mutations do nothing while a few change a protein and a phenotype.
Natural selection
Write natural selection as a sequence for GCSE Biology: variation, competition, survival, reproduction and alleles becoming more common, with antibiotic-resistant bacteria as the example.
Genetic engineering
Explain genetic engineering for GCSE Biology: cut a gene with restriction enzymes, insert it into a plasmid with ligase, transform bacteria, and evaluate GM crops and insulin without hype or panic.
Food chains and biomass
Build food chains for GCSE Biology: producer, primary and secondary consumers, pyramids of biomass drawn to scale, and why only about 10% of biomass is passed on at each trophic level.
The carbon cycle
Track carbon for GCSE Biology: photosynthesis removes CO₂, respiration and combustion return it, decomposition recycles biomass, and fossil-fuel use plus deforestation shift the atmosphere’s balance.
Biodiversity
Define biodiversity for GCSE Biology as the variety of species, explain why it stabilises ecosystems, and link deforestation, peat destruction, pollution and global warming to specific mechanisms of loss.
Quadrats and sampling
Plan quadrat and transect sampling for GCSE Biology: random coordinates in a uniform field, a line transect on a gradient, mean scaled to area, and why choosing a “typical patch” is bias.
Decay and decomposition
Explain decay for GCSE Biology: bacteria and fungi respire dead material, releasing minerals and CO₂ fastest when it is warm, moist and aerobic, and apply that to compost, food storage and the carbon cycle.
Keep going
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