GCSE Biology
Inheritance, Variation & Evolution
Inheritance, Variation & Evolution is a core strand in Biology. Work through the topics below in any order, or follow your course — each guide includes explanations, common mistakes and exam-style practice.
Topic guides
DNA & Genetics
DNA (deoxyribonucleic acid) is the molecule that carries the genetic instructions for the development, functioning, growth and reproduction of all known organis
Open guideChromosomes & Genes
Chromosomes are long, coiled molecules of DNA found in the nucleus of eukaryotic cells, carrying a large number of genes.
Open guideGenetic Inheritance
Genetic inheritance is the process by which genetic information is passed from parent to offspring.
Open guideVariation
Variation is the differences in characteristics between individuals within a species.
Open guideGenetic Disorders
Genetic disorders are conditions caused by abnormalities in an individual's DNA.
Open guideSelective Breeding
Selective breeding, also known as artificial selection, is the process by which humans breed plants and animals for particular genetic characteristics.
Open guideGenetic Engineering
Genetic engineering is a process that involves modifying the genome of an organism by introducing a gene from another organism to give a desired characteristic.
Open guideCloning
Cloning is the process of creating a genetically identical copy of an organism.
Open guideNatural Selection & Evolution
Evolution is the gradual change in the inherited characteristics of a population over time, which can lead to the formation of new species.
Open guideClassification
Classification is the organisation of living organisms into groups based on their similarities and evolutionary relationships.
Open guideEvidence for Evolution
The theory of evolution is supported by a vast body of evidence from different fields.
Open guide
Revision strategy
Students often slip on the details explained in our guides — read the “common mistakes” section in each topic.
- Alternate between reading a guide and doing timed questions — don’t only re-read notes.
- Return to this hub anytime; new guides appear automatically as we publish them.