GCSE Biology Evolution Revision Notes
Master GCSE Biology Evolution using simple revision notes, key facts and practice questions — all generated by AI for your exam.
Evolution is the process by which species change over time through natural selection and genetic variation. It explains how all living organisms are related and have adapted to their environments.
Key Concepts
- 1Natural selection is the mechanism of evolution.
- 2Genetic variation occurs through mutations and sexual reproduction.
- 3Survival of the fittest means that organisms best adapted to their environment are more likely to survive and reproduce.
- 4Fossil records provide evidence for evolution.
- 5Species can diverge from common ancestors over time.
Simple Explanation
Evolution is how living things change and adapt over long periods. It happens because some traits help organisms survive better in their environment, and these traits get passed on to their offspring. Over time, these changes can lead to new species. Scientists use fossils and genetic studies to understand how evolution works.
Memory Trick
“Remember 'Nasty Green Snakes Find Snacks' for Natural selection, Genetic variation, Survival of the fittest, Fossil records, and Species divergence.”
Flashcards
What is natural selection?
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Exam Questions
Describe and explain the process of natural selection. [6 marks]
6 marksView mark scheme hint▾
Define natural selection, explain variation, survival, reproduction, and adaptation.
Explain how fossils provide evidence for evolution. [4 marks]
4 marksView mark scheme hint▾
Discuss fossil records, transitional forms, and changes over time.
What is meant by genetic variation? [2 marks]
2 marksView mark scheme hint▾
Define genetic variation and mention its causes.
Practice Quiz
What is the main mechanism of evolution?
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