Evolutionary Biology Basics

Overview

This 60-minute session is Lesson 15 in the 20-lesson unit Exploring the Wonders of Science for Year 11 students, tailored to the National Curriculum for England (Key Stage 4). The lesson introduces the fundamental concepts of evolution and natural selection, enabling students to understand how species change over time due to environmental pressures and inheritance.

National Curriculum References

Biology - Evolution (Key Stage 4 - Years 9-11)
- Understand the theory of evolution by natural selection (Programmes of Study, GCSE Biology, AQA specification, 2015).
- Recognise how genetic variation and environmental factors influence survival.
- Explain adaptations and provide examples from both plants and animals.

Learning Objectives

By the end of the lesson, students will:

Define evolution and natural selection in clear terms.
Describe the key principles behind natural selection: variation, competition, survival, and reproduction.
Illustrate natural selection using relevant examples appropriate to human and animal biology.
Explain how environmental factors influence adaptations.

Success Criteria

Accurately explain what evolution means and how natural selection works.
Provide at least two examples of natural selection in action (e.g., antibiotic resistance in bacteria, peppered moth colour variation).
Use scientific vocabulary such as variation, adaptation, phenotype, genotype, selective pressure, and survival of the fittest correctly.
Demonstrate understanding by constructing a simple natural selection scenario.

Resources

Whiteboard and markers
Printed diagram handouts: Peppered moth natural selection, antibiotic resistance flowchart
Video clip: Natural selection in action (3 minutes)
Individual student mini-whiteboards and pens
Evolution card sorting activity (cards represent traits, organisms, environments)

Lesson Timings & Activities

Time	Activity	Description	Success Criteria Focus
0-5 mins	Starter Quiz	Quick recall quiz using mini-whiteboards: “What is evolution?” “Name one example of an adaptation.”	Engage prior knowledge; assess baseline understanding
5-15 mins	Direct Teaching Input	Teacher-led explanation covering:

Definition of evolution and natural selection
Four main components: variation, inheritance, selection, time
Introduce scientific vocabulary | Grasp core concepts and terminology | | 15-25 mins | Video + Discussion | Watch a short video illustrating natural selection (peppered moth example). Discuss observations and how natural selection caused moth colour change. | Visualise concept; connect theory with real-world example | | 25-40 mins | Card Sorting Activity | Students sort cards into groups describing traits, environmental pressures, and outcomes to build a natural selection story. Teacher facilitates and prompts critical thinking with targeted questions. | Apply concepts interactively; use scientific vocabulary | | 40-50 mins | Student Explanation Task | On mini-whiteboards, students draw or write their own simple example of natural selection (e.g., antibiotic resistance or giraffe neck length). Peer feedback in pairs. | Demonstrate understanding through creation and explanation | | 50-60 mins | Plenary & Success Criteria Review | Recap lesson aims and success criteria. Discuss any misconceptions. Quick exit question: “What would happen if the environment changed suddenly?” | Reflect on learning; consolidate understanding |

Differentiation

Allow scaffolding with sentence starters for lower ability or EAL students, e.g., “Natural selection means…”, “An example is…”
Extension task: Research a current example of evolution (e.g., COVID-19 variants) for advanced students.

Assessment & Feedback

Formative assessment via mini-whiteboard quiz and card activity.
Peer and teacher feedback during explanation task.
Exit question responses used to identify understanding gaps for next lesson.

Homework (Optional)

Research and prepare a short presentation or poster on an example of evolution in plants or animals relevant to their local environment or interests.

Reflection for Teachers

Monitor student use of vocabulary to gauge conceptual grasp.
Encourage students to link previous knowledge of genetics to evolution concepts.
Use anecdotal notes from card sorting to target misconceptions in future lessons.

This lesson supports the National Curriculum’s focus on deepening understanding of biological processes underpinning human health and the diversity of life and fosters critical scientific literacy through inquiry and application.

Teaching Instructions