GCSE Biology Revision — Natural Selection & Evolution
Revise Natural Selection & Evolution for GCSE Biology with a topic explanation, worked example and common mistakes. Check the board notes for specification differences.
At a glance
- What StudyVector is
- An exam-practice platform with board-aligned questions, explanations, and adaptive next steps.
- This topic
- Natural Selection & Evolution in GCSE Biology: explanation, examples, and practice links on this page.
- Who it’s for
- Students revising GCSE Biology for UK exams.
- Exam boards
- Check your course page and the topic board notes for supported specifications.
- Free plan
- Sign up free to use tutor paths and feedback on your answers. Free access is Free daily revision · No card required. Pricing
- What makes it different
- Syllabus-shaped practice and progress tracking—not generic AI answers.
This page includes a topic explanation and a worked example. Check your course for current practice coverage.
Next in this topic area
Next step: Classification
Continue in the same course — structured practice and explanations on StudyVector.
Go to ClassificationTopic explanation
What is Natural 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. The theory of evolution by natural selection, proposed by Charles Darwin, states that all species have evolved from simple life forms. Natural selection is the process where organisms better adapted to their environment tend to survive and reproduce, passing on their advantageous alleles.
Board notes: A fundamental concept for all major boards (AQA, Edexcel, OCR). The principles of variation, competition, survival of the fittest, and reproduction are key.
Step-by-step explanationWorked examples
Worked example
In a population of moths, there is variation in colour, with some being light and some being dark. In a polluted industrial area where trees are blackened by soot, the dark moths are better camouflaged from predators. More dark moths survive to reproduce and pass on the allele for dark colour. Over generations, the frequency of the dark allele increases in the population.
Practise this topic
Start with low-focus cards for Natural Selection & Evolution, then move into full exam-style practice when you want the heavier session.
Common mistakes
- 1Thinking that an organism can 'choose' to adapt. Adaptation is a result of random genetic mutations that happen to be beneficial in a particular environment; it is not a conscious process.
- 2Confusing evolution with natural selection. Natural selection is the mechanism by which evolution occurs.
- 3Believing that evolution is 'just a theory'. In science, a theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment.
Natural Selection & Evolution exam questions
Check the available question sets for Natural Selection & Evolution. Use your course and exam board to confirm which practice is relevant.
Natural Selection & Evolution exam questionsGet help with Natural Selection & Evolution
Get a personalised explanation for Natural Selection & Evolution from the StudyVector tutor. Ask follow-up questions and work through problems with step-by-step support.
Open tutorSave your progress in Natural Selection & Evolution
Start a free account for low-focus question cards, feedback and Play routes across available topics. Free daily limits apply; no card required.
Continue your revision
A public question for Natural Selection & Evolution is still being reviewed. Your course page shows the topics currently available for practice.
Continue with Natural Selection & Evolution
Create a free account to keep your course choice and save your practice progress.
Start free low-focus cardsAlready have an account? Log in
Frequently asked questions
What is natural selection?
Natural selection is the process where individuals with genetic traits better suited to their environment are more likely to survive, reproduce, and pass on those advantageous traits to their offspring.
Who was Charles Darwin?
Charles Darwin was a 19th-century English naturalist who proposed the theory of evolution by natural selection. His groundbreaking book, 'On the Origin of Species', published in 1859, laid the foundation for modern evolutionary biology.