Key term
AQA GCSE Biology 8461
Bioenergetics
Cell Biology
Topic overviewEukaryotes and prokaryotesAnimal and plant cellsCell specialisation and differentiationMicroscopyGrowing bacteria and aseptic techniqueCalculating bacterial growth, and testing antiseptics and antibioticsChromosomes, mitosis and the cell cycleStem cells in embryos, adults and meristemsTherapeutic cloning, its risks, and cloning plantsDiffusion and the factors affecting its rateSurface area to volume ratio and exchange surfacesOsmosisActive transport
Ecology
Topic overviewLevels of organisation in an ecosystem, and what organisms needCompetition, interdependence and stable communitiesAbiotic factorsBiotic factorsAdaptationsProducers, food chains and sampling with quadrats and transectsPredators, prey and measuring population sizeHow materials are cycledDecompositionWaste management and biodiversityLand use, deforestation and global warmingMaintaining biodiversityTrophic levels and pyramids of biomassTransfer of biomassFactors affecting food securityFarming techniques and sustainable fisheriesRole of biotechnology
Homeostasis and Response
Topic overviewHomeostasisThe nervous system and the reflex arcThe structure of the eye and accommodationMyopia, hyperopia and how they are correctedThe brain and the control of body temperatureHuman endocrine systemInsulin, glucagon and diabetesWater and ion loss, and the production of ureaThe kidneys, ADH and treating kidney failureHormones in human reproductionContraceptionPlant hormones and their uses
Infection and Response
Inheritance, Variation and Evolution
Topic overviewSexual and asexual reproductionMeiosisAdvantages and disadvantages of sexual and asexual reproductionDNA and the genomeDNA as a polymer of four nucleotidesGenetic terms, dominant and recessive allelesPunnett squares, probability and genetic crossesInherited disorders and sex determinationVariationEvolutionSelective breedingWhat genetic engineering is, and what it is used forGM crops, their risks, and the steps of the processCloningDarwin, Lamarck and the acceptance of evolutionSpeciationThe understanding of geneticsEvidence for evolution, and extinctionFossilsResistant bacteriaClassification of living organisms
Organisation
Topic overviewLevels of organisation, and how enzymes workAmylase, proteases and lipasesBile, food tests and the effect of pH on amylaseThe heart, the lungs and double circulationThe pacemaker, the blood vessels and the bloodCoronary heart disease: a non-communicable diseaseHealth issuesRisk factors and causal mechanisms in diseaseSampling, correlation and interpreting risk dataCancerPlant tissues, and transpiration and its rateRoot hair cells, xylem, phloem and stomata
Inheritance, Variation and Evolution
Darwin, Lamarck and the acceptance of evolution
- 2 things to know
- Paper 2
Overview
Darwin's observations, the theory of natural selection and On the Origin of Species, why acceptance was slow, the later discovery of genes, and Lamarck's idea of inherited acquired changes.
What you need to know
Answer each one before you reveal it.
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Key term
What did Darwin observe about a characteristic within a single species?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Who proposed the theory of evolution by natural selection following observations made on a round the world expedition?
Model answer
Charles Darwin.
- 2
What did Darwin do to support his ideas after making his observations?
Model answer
He backed them with years of experimentation and discussion.
- 3
Which two developing areas of scientific knowledge was Darwin's theory linked to?
Model answer
The developing knowledge of geology and of fossils.
- 4
What did Darwin observe about a characteristic within a single species?
Model answer
Individual organisms show a wide range of variation for it.
- 5
According to Darwin's theory, which individuals are more likely to survive and breed successfully?
Model answer
Those with the characteristics most suited to their environment.
- 6
What happens to the characteristics that enabled individuals to survive?
Model answer
They are passed on to the next generation.
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