OCR Biology Evolution Revision Notes
Master OCR 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 leads to the survival of the fittest.
- 2Genetic variation is crucial for evolution.
- 3Speciation occurs when populations diverge.
- 4Fossil records provide evidence of evolutionary change.
- 5Evolution is supported by molecular biology and comparative anatomy.
Simple Explanation
Evolution is how living things change and adapt over time. It happens because some traits help organisms survive better than others. When these traits are passed down to future generations, they can lead to new species. This process helps explain why there are so many different types of plants and animals today.
Memory Trick
“Use the acronym 'E.N.S.C.F.' to remember: Evolution, Natural selection, Speciation, Change, Fossils.”
Flashcards
What is natural selection?
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Exam Questions
Describe and explain the process of natural selection and its role in evolution. [6 marks]
6 marksView mark scheme hint▾
Define natural selection, describe the steps involved, and explain its significance in evolution.
Explain how genetic variation contributes to the process of evolution. [4 marks]
4 marksView mark scheme hint▾
Discuss the sources of genetic variation and its importance for natural selection.
What is meant by the term 'speciation'? [2 marks]
2 marksView mark scheme hint▾
Define speciation and provide an example of how it occurs.
Practice Quiz
What is the primary mechanism of evolution?
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