AQA Biology Evolution Revision Notes
Master AQA 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 due to genetic variation and natural selection. It explains the diversity of life on Earth and how organisms adapt to their environments.
Key Concepts
- 1Natural selection is the mechanism by which evolution occurs.
- 2Genetic variation within a population is essential for evolution.
- 3Adaptations are traits that enhance an organism's fitness in its environment.
- 4Speciation occurs when populations become reproductively isolated.
- 5Fossil records provide evidence for evolutionary change over time.
Simple Explanation
Evolution is how living things change and adapt over long periods. It happens because some individuals in a species have traits that help them survive better than others. These traits can be passed on to their offspring, leading to gradual changes in the species. Over time, these changes can result in new species forming.
Memory Trick
“Remember 'NAGS' for Natural selection, Adaptation, Genetic variation, and Speciation.”
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 of the fittest, and reproduction.
Explain how genetic variation contributes to evolution. [4 marks]
4 marksView mark scheme hint▾
Discuss sources of genetic variation and its role in natural selection.
What is meant by speciation? [2 marks]
2 marksView mark scheme hint▾
Define speciation and mention reproductive isolation.
Practice Quiz
What is the main mechanism of evolution?
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