Natural Selection Uncovered

Grade Level

6th Grade

Duration

50 minutes

Unit

Exploring Evolutionary Concepts (Lesson 2 of 25)

Common Core Connections

Next Generation Science Standards (NGSS) Alignment

MS-LS4-4: Construct an explanation based on evidence that describes how genetic variations of traits in a population increase some individuals’ probability of surviving and reproducing in a specific environment.
MS-LS4-5: Gather and synthesize information about the ways humans impact biodiversity and the application of natural selection.

Common Core State Standards for English Language Arts (CCSS.ELA-LITERACY)

RI.6.1: Cite textual evidence to support analysis of science texts on natural selection.
SL.6.4: Present claims and findings, sequencing ideas logically with appropriate facts and relevant details about natural selection.

Learning Objectives

By the end of this lesson, students will be able to:

Explain the process of natural selection using evidence-based reasoning.
Identify examples of natural selection in various environments.
Describe how genetic variation influences survival and reproduction within a population.
Communicate scientific ideas clearly both verbally and in writing.

Materials Needed

Whiteboard and markers
Printed scenario cards with different animal adaptations (20 cards, one per student)
"Survival of the Fittest" game setup (colored paper, plastic chips)
Student science notebooks or journals
Projector for short video clip (optional)
Exit ticket handouts

Lesson Procedure

1. Engage (7 minutes)

Begin with a quick, thought-provoking question on the board: “Why do some animals survive in their environment while others don’t?”
Facilitate a 3-minute whole-class brainstorming session.
Briefly introduce the term natural selection and explain that today they will understand how this process shapes evolution.

2. Explore: "Survival of the Fittest" Game (15 minutes)

Distribute animal adaptation scenario cards randomly (each student gets a unique adaptation trait).
Explain the game: each student represents an organism in an environment (described on a large poster).
Use colored papers representing environmental factors (e.g., temperature, vegetation, predators) on the floor.
Students move around the room based on how well their trait matches the environment (e.g., camouflage card moves closer to “forest” colored paper).
Those whose traits are not adapted to the environment "sit out" for the next round ("didn't survive").
Run 3 rounds with slightly changing environmental conditions.
After the game, lead a short reflection discussion: What happened to organisms that were better adapted? Why did some traits become more common?

3. Explain: Mini-Lecture & Video Clip (10 minutes)

Present key principles of natural selection on the board:
- Variation exists within populations.
- Some traits confer a survival advantage.
- Better-adapted organisms reproduce more successfully.
Show a 3-minute curated video clip (animated or documentary snippet) demonstrating natural selection in action (e.g., peppered moth example).
Pause to reinforce critical vocabulary and concepts.

4. Elaborate: Text Evidence Activity (10 minutes)

Hand out a short, age-appropriate science passage describing an example of natural selection.
Students read individually or in pairs.
Prompt them to highlight or underline evidence that explains how natural selection is happening.
Discuss answers as a class citing lines from the text (aligns with CCSS RI.6.1).

5. Evaluate: Exit Ticket & Reflection (8 minutes)

Students write a short response in their science journals to this prompt: “Explain in your own words how natural selection helps populations change over time.”
Collect exit tickets.
Optionally, ask 2-3 students to share their explanations aloud (aligns with CCSS SL.6.4).

Instructional Strategies & Differentiation

Visual learners: Use posters, video, and color-coded game materials.
Kinesthetic learners: Actively engaging in the movement game to experience natural selection firsthand.
Reading support: Provide paired reading for struggling readers.
Language support: Pre-teach vocabulary with word walls.
Challenge: Students with advanced understanding asked to brainstorm additional examples or human impacts on natural selection for discussion.

Assessment

Formative assessment through observation during the "Survival of the Fittest" game and class discussions.
Summative assessment via exit ticket response for understanding of natural selection.
Text evidence highlighting activity assesses ability to analyze scientific texts.

Reflection for Teachers

Was the game effective at demonstrating natural selection concepts?
Did students make meaningful connections between traits, environment, and survival?
Were all students actively engaged in reading and discussion?
Consider adjusting pacing or complexity of texts for diverse learners next time.

This lesson plan engages 6th graders deeply with natural selection by combining scientific inquiry, reading comprehension, and hands-on learning — all aligned closely with Common Core and NGSS standards for a measurable and memorable experience.

Teaching Instructions