Evolution of Species

Overview

Grade: 6
Duration: 50 minutes
Class Size: 20 students
Unit: Exploring Evolutionary Concepts (Lesson 13 of 25)
Topic: Speciation and How New Species Arise

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Learning Objectives

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

• Define speciation and explain the process by which new species arise.
• Identify factors that contribute to speciation (e.g., geographic isolation, natural selection).
• Analyze simple scenarios to determine potential for speciation.
• Collaborate and communicate scientific ideas effectively.

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Standards Alignment

Next Generation Science Standards (NGSS) – aligned with Common Core integration

MS-LS4-2: Construct an explanation based on evidence that describes how genetic variation of traits in a population increases some individuals’ probability of surviving and reproducing in a specific environment.

MS-LS4-4: Make a claim about the merit of a solution to reduce the impacts of human activities on biodiversity.

Common Core State Standards (CCSS) for English Language Arts & Literacy in Science and Technical Subjects

CCSS.ELA-LITERACY.RST.6-8.3: Follow precisely a multistep procedure when carrying out experiments, taking measurements, or performing technical tasks.

CCSS.ELA-LITERACY.SL.6.1: Engage effectively in a range of collaborative discussions with diverse partners on grade 6 topics, texts, and issues, building on others’ ideas and expressing their own clearly.

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Materials Needed

• Whiteboard and markers
• Printed scenario cards describing different evolutionary conditions
• Speciation graphic organizer worksheet
• “Species Evolution” short video (~4 minutes)
• Colored pencils or markers
• Timer
• Exit tickets (short reflection questions)

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Lesson Flow

1. Engage (5 minutes)

• Begin with a question on the board: “How do you think new kinds of animals or plants come into existence?”
• Have students write a 1-2 sentence prediction on a sticky note and place it on the board.
• Briefly discuss some of the predictions to activate prior knowledge and spark curiosity.

2. Explore: Watch & Define (7 minutes)

• Show the short video that introduces speciation in simple terms using examples such as Darwin’s finches.
• After the video, ask students to turn and talk with a partner to come up with a definition of speciation in their own words.
• Select a few students to share their definitions. Write a student-friendly formal definition on the board:
  “Speciation is when one group of organisms changes over time and becomes a new species that can no longer breed with the original group.”

3. Explain: Interactive Mini-Lecture + Graphic Organizer (10 minutes)

• Define key concepts: genetic variation, natural selection, geographic isolation. Use simple diagrams to illustrate geographic isolation (e.g., river dividing populations).
• Distribute the speciation graphic organizer where students list factors leading to speciation and examples.
• Model completing one row together (e.g., geographic isolation causing birds on different islands to develop different traits).
• Students complete the rest individually with teacher support.

4. Elaborate: Group Scenario Activity (15 minutes)

• Divide class into 4 groups of 5 students. Each group receives a scenario card describing a population experiencing varied conditions (mountain separation, climate change, migration barriers).
• Groups discuss the likelihood of speciation occurring based on their scenario. They use their graphic organizer knowledge to support their reasoning.
• Each group prepares a 2-minute explanation of their scenario and conclusion about speciation likelihood.

5. Share/Discuss (8 minutes)

• Groups present their findings to the class.
• Encourage peer questions using sentence starters like: “Can you explain why that leads to speciation?” or “Is there any evidence that might disagree with your scenario?”
• Summarize key points on the board emphasizing that speciation is gradual and driven by environmental pressures and reproductive isolation.

6. Evaluate: Exit Ticket (5 minutes)

• Hand out exit tickets with two questions:
  1. What is speciation?
  2. Name one factor that can cause speciation and explain how it works.
• Collect tickets to assess understanding and guide future lessons.

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Differentiation & Accessibility

• Provide sentence starters and vocabulary lists for ELL students and those needing support.
• Use visuals, diagrams, and videos to accommodate different learning styles.
• Allow gifted students to consider additional speciation factors like mutations or sexual selection during the scenario activity.

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Extension Idea (optional)

Have interested students research one example of speciation in the real world (e.g., cichlid fish in African lakes) and present a short paragraph or drawing for the next class.

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Reflection for Teacher

• Were students able to articulate speciation in their own words?
• Did group discussions promote critical thinking on evolutionary processes?
• How well did students complete the graphic organizer, and what misconceptions arose?
• What modifications can be made for upcoming lessons to deepen understanding?

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This lesson plan combines interactive exploration, collaboration, and scientific communication aligned with both NGSS and Common Core to ensure holistic, age-appropriate understanding of speciation in evolutionary biology.