Edexcel Biology Evolution Revision Notes
Master Edexcel Biology Evolution using simple revision notes, key facts and practice questions — all generated by AI for your exam.
Evolution is the process through which species change over time through mechanisms such as natural selection and genetic drift. It explains the diversity of life on Earth and how organisms adapt to their environments.
Key Concepts
- 1Natural selection is the mechanism by which individuals with advantageous traits survive and reproduce.
- 2Genetic variation within a population is essential for evolution to occur.
- 3Speciation is the process by which new species arise from existing ones.
- 4Fossil records provide evidence for evolutionary change over time.
- 5Common descent suggests that all living organisms share a common ancestor.
Simple Explanation
Evolution is how living things change and adapt over time. It happens because some traits help organisms survive better than others, so those traits get passed on to future generations. Over a long time, these changes can lead to new species. Fossils show us how life has changed on Earth.
Memory Trick
“Remember 'N-G-S-F-C' for 'Natural selection, Genetic variation, Speciation, Fossil evidence, Common descent' to recall the key concepts of evolution.”
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, describe its steps (variation, competition, survival of the fittest, reproduction), and provide an example.
Explain how fossil evidence supports the theory of evolution. [4 marks]
4 marksView mark scheme hint▾
Discuss how fossils show changes over time and link extinct species to modern species.
What is meant by genetic drift? [2 marks]
2 marksView mark scheme hint▾
Define genetic drift and explain its impact on small populations.
Practice Quiz
What is the primary mechanism of evolution?
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