Process
Edexcel GCSE Combined Science Biology 1SC0
Key Concepts in Biology
Topic overviewEukaryotic and prokaryotic cellsSpecialised cells and their adaptationsMicroscopes and magnification calculationsSize, scale and units in cell biologyEnzyme action and denaturationFactors affecting enzyme activityEnzymes in synthesis and digestion, and rate calculationsDiffusion, osmosis and active transportOsmosis in potatoes and percentage change in mass
Cells and Control
Genetics
Topic overviewMeiosis and the formation of gametesDNA structure, genes and the genomeExtracting DNA from fruitAlleles, genotype and phenotypeMonohybrid crosses and sex determinationProbability and ratios from genetic crossesCauses of variation: genes and environmentThe Human Genome ProjectGenetic variation and the effects of mutation
Natural Selection and Genetic Modification
Health, Disease and the Development of Medicines
Topic overviewHealth, disease and susceptibilityPathogens and common infectionsHow pathogens spread, and the virus life cycleSexually transmitted infectionsPhysical barriers and chemical defencesThe immune system, immunisation and herd immunityAntibiotics and developing new medicinesLifestyle factors and non-communicable diseaseTreatments for cardiovascular disease
Plant Structures and Their Functions
Animal Coordination, Control and Homeostasis
Exchange and Transport in Animals
Topic overviewWhy multicellular organisms need exchange surfacesAlveoli and gas exchangeThe blood and its componentsArteries, veins and capillariesThe heart and the circulatory systemCellular respiration as an exothermic reactionAerobic and anaerobic respiration comparedInvestigating the rate of respirationCardiac output, stroke volume and heart rate
Ecosystems and Material Cycles
Animal Coordination, Control and Homeostasis
Assisted reproductive technology and IVF
- 3 things to know
- Paper 2
Overview
Assisted reproductive technology, clomifene therapy and how it raises FSH and LH to trigger ovulation, the stages of IVF and why FSH and LH are given, and why IVF often fails and the risk of multiple pregnancy.
What you need to know
Answer each one before you reveal it.
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Key term
Why is FSH given before eggs are collected for IVF?
Key term
Why is LH also given during IVF treatment?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is meant by assisted reproductive technology?
Model answer
It is the use of medical techniques, often involving hormones, to help a person become pregnant.
- 2
What is clomifene therapy used to treat?
Model answer
It is used to help someone who does not ovulate regularly to release an egg.
- 3
Explain how clomifene increases the chance of becoming pregnant.
Model answer
It increases the release of FSH and LH from the pituitary gland, so an egg matures and is released.
- 4
Outline the main stages of IVF treatment.
Model answer
Hormones stimulate the ovaries, eggs are collected and fertilised with sperm in a dish, and one or more resulting embryos are placed into the uterus.
- 5
Why is FSH given before eggs are collected for IVF?
Model answer
FSH makes several eggs mature at the same time so more than one can be collected.
- 6
Why is LH also given during IVF treatment?
Model answer
LH causes the mature eggs to be released so they can be collected.
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