1. US Curriculums
  2. NGSS
  3. Grade 10
  4. Science
  5. Construct an explanation based on evidence that the process of evolution primarily results from four factors: (1) the potential for a species to increase in number, (2) the heritable genetic variation of individuals in a species due to mutation and sexual reproduction, (3) competition for limited resources, and (4) the proliferation of those organisms that are better able to survive and reproduce in the environment

Grade 10 · Science

Construct an explanation based on evidence that the process of evolution primarily results from four factors: (1) the potential for a species to increase in number, (2) the heritable genetic variation of individuals in a species due to mutation and sexual reproduction, (3) competition for limited resources, and (4) the proliferation of those organisms that are better able to survive and reproduce in the environment

Quarter 4 · Week 1 · NGSS

Standards Alignment

  • HS-LS4-2 primary
    Construct an explanation based on evidence that the process of evolution primarily results from four factors: (1) the potential for a species to increase in number, (2) the heritable genetic variation of individuals in a species due to mutation and sexual reproduction, (3) competition for limited resources, and (4) the proliferation of those organisms that are better able to survive and reproduce in the environment.

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Lesson Overview

This Grade 10 science lesson guides students to construct scientific explanations based on evidence about how evolution occurs primarily due to four factors: the potential for species to increase in number, heritable genetic variation from mutation and sexual reproduction, competition for limited resources, and the proliferation of organisms better adapted to survive and reproduce. Students engage with models, data analysis, and scientific reasoning to understand natural selection and evolutionary adaptation within ecosystems, aligned with NGSS HS-LS4-2.

Learning Objectives

  • Explain how the potential for a species to increase in number influences evolution.
  • Describe how heritable genetic variation arises from mutation and sexual reproduction and its role in evolution.
  • Analyze how competition for limited resources affects survival and reproduction.
  • Explain how organisms better adapted to their environment proliferate over time, leading to evolutionary change.
  • Construct a scientific explanation using evidence that integrates these four factors to describe the process of evolution.

Success Criteria

  • Identify and describe the four main factors that drive evolution.
  • Use evidence from models or data to support explanations about evolutionary processes.
  • Explain how genetic variation and environmental pressures interact to influence survival.
  • Construct clear, evidence-based explanations linking population growth, genetic variation, competition, and natural selection.
  • Demonstrate understanding of how these factors lead to adaptation in populations over generations.

Prerequisite Knowledge

Students should understand basic concepts of genetics including mutation and sexual reproduction, the idea of species and populations, and the concept of limited resources in an ecosystem.

Key Vocabulary

  • Evolution
  • Natural selection
  • Genetic variation
  • Mutation
  • Sexual reproduction
  • Competition
  • Adaptation
  • Proliferation
  • Species
  • Population

Materials and Resources

  • Models or diagrams illustrating genetic variation and population growth
  • Case studies or data sets showing competition and survival outcomes
  • Worksheets for constructing explanations
  • Visual aids showing examples of adaptation

Teacher Preparation

  • Prepare models or simulations demonstrating genetic variation and population increase.
  • Gather case studies or data on species competition and survival.
  • Develop guiding questions to prompt evidence-based explanations.
  • Prepare graphic organizers to help students structure their explanations.

Detailed Lesson Notes

The Four Factors Driving Evolution

Evolution is primarily driven by four interrelated factors: (1) the potential for a species to increase in number means populations can grow rapidly if resources allow; (2) heritable genetic variation arises from mutations and sexual reproduction, creating differences among individuals; (3) competition for limited resources means not all individuals survive or reproduce equally; (4) organisms better adapted to their environment tend to survive and reproduce more, leading to the proliferation of advantageous traits in the population over time.

Potential for Species to Increase in Number

Species have the biological capacity to produce more offspring than the environment can support. This potential growth creates pressure on populations, as more individuals compete for finite resources such as food, space, and mates. This overproduction is a key driver of natural selection because it leads to survival challenges.

Heritable Genetic Variation from Mutation and Sexual Reproduction

Genetic variation within a species arises through random mutations in DNA and the reshuffling of genes during sexual reproduction. These variations can affect an organism's traits, some of which may improve or reduce its chances of survival and reproduction. Only heritable variations passed to offspring influence evolution.

Competition for Limited Resources

Because resources are limited, individuals within a population compete for what they need to survive and reproduce. This competition means that not all individuals will survive to reproduce. Those with traits better suited to obtaining resources or avoiding predators have a survival advantage.

Proliferation of Better-Adapted Organisms

Organisms with advantageous traits that improve survival and reproductive success tend to leave more offspring. Over generations, these traits become more common in the population, leading to adaptation. This process explains how populations evolve to become better suited to their environments.

Constructing Scientific Explanations Based on Evidence

Students should use evidence from models, data, and observations to explain how these four factors interact to drive evolution. Explanations should clearly link population growth, genetic variation, competition, and natural selection, showing how these processes lead to changes in populations over time.

Worked Examples

Worked Example 1

Scenario

Given a population of beetles where some are green and some are brown, and the environment has mostly brown tree bark, explain why the brown beetles might become more common over time.

Explanation

Brown beetles are better camouflaged against the brown bark, so they are less likely to be seen and eaten by predators. Because the species can produce many offspring, and there is genetic variation in color, the brown beetles survive and reproduce more successfully. Over time, competition for survival favors brown beetles, leading to their proliferation in the population.

Answer Guide

The brown beetles survive better because they blend into the environment, so they reproduce more. This causes the brown trait to increase in the population over generations due to natural selection.

Engage

Teacher Activity

Introduce the concept of evolution by asking students what factors might cause species to change over time. Show a short video or image series illustrating diverse species and their adaptations.

Student Activity

Discuss initial ideas about why species change and what might influence survival and reproduction. Share examples of animals or plants that have adapted to their environments.

Explanation

Engage students by connecting their prior knowledge and curiosity about living things to the scientific question of how evolution happens.

Examples

  • Students suggest factors like environment, competition, or reproduction.
  • Students recognize that survival varies among individuals.
  • Students understand that species can produce many offspring.

Explore

Teacher Activity

Provide students with models or simulations showing populations with genetic variation and limited resources. Guide them to observe how different traits affect survival and reproduction.

Student Activity

Analyze the models or data to identify how genetic variation and competition influence which individuals survive and reproduce.

Explanation

Students explore evidence showing the interaction of genetic variation and environmental pressures leading to differential survival.

Examples

  • Students observe variation in traits among individuals.
  • Students note that not all individuals survive due to resource limits.
  • Students identify that individuals with certain traits survive better.

Explain

Teacher Activity

Facilitate a class discussion to construct a scientific explanation that integrates the four factors driving evolution. Use student observations and evidence from the explore phase.

Student Activity

Use evidence from models and data to explain how the potential to increase in number, genetic variation, competition, and proliferation of better-adapted organisms drive evolution.

Explanation

Students articulate a coherent explanation based on evidence linking the four factors to evolutionary change.

Examples

  • Students explain the role of population growth in creating competition.
  • Students describe how genetic variation provides material for natural selection.
  • Students explain how better-adapted organisms proliferate.

Elaborate

Teacher Activity

Present a case study or real-world example of evolution, such as antibiotic resistance or peppered moth coloration changes. Guide students to apply the four-factor explanation to the example.

Student Activity

Analyze the case study to identify evidence of the four factors and explain how they led to evolutionary change in the example population.

Explanation

Students deepen understanding by applying the four-factor model to real biological scenarios, reinforcing scientific reasoning.

Examples

  • Students identify mutations or trait differences in the example.
  • Students note competition or environmental pressures.
  • Students explain how certain traits increased in frequency.

Evaluate

Teacher Activity

Assign students to write or present an explanation of evolution based on the four factors, using evidence from models, data, or case studies. Provide feedback on clarity and use of evidence.

Student Activity

Construct and communicate a scientific explanation that clearly connects the four factors to evolutionary processes, citing specific evidence.

Explanation

Assessment focuses on students' ability to integrate evidence and reasoning to explain evolution scientifically.

Examples

  • Students produce explanations that include all four factors.
  • Students cite evidence from investigations or examples.
  • Explanations demonstrate understanding of natural selection.

Classroom Activity

Analyze the models or data to identify how genetic variation and competition influence which individuals survive and reproduce.

Guided Practice

Guided Practice 1

Prompt

What causes genetic variation in a species?

Teacher Answer Guide

Mutation and sexual reproduction cause genetic variation by creating differences in individuals' genes.

Guided Practice 2

Prompt

Why does producing many offspring lead to competition?

Teacher Answer Guide

Because resources are limited, more offspring than can survive must compete for food, space, and mates.

Guided Practice 3

Prompt

How does competition affect survival?

Teacher Answer Guide

Individuals better able to compete for resources survive and reproduce more than others.

Guided Practice 4

Prompt

How do the four factors of evolution interact?

Teacher Answer Guide

Population growth creates competition; genetic variation provides traits; competition selects for advantageous traits; these traits increase in the population over time.

Guided Practice 5

Prompt

How does natural selection cause adaptation?

Teacher Answer Guide

Natural selection favors organisms with advantageous traits, increasing those traits in the population and leading to adaptation.

Independent Practice

  1. Foundational: What is one way genetic variation occurs in a species?
  2. Developing: Explain why a species producing many offspring can lead to competition.
  3. Application: Describe how competition for limited resources can affect which organisms survive in a population.
  4. Analysis: Analyze how the four factors of evolution work together to cause changes in a population over time.
  5. Challenge: Construct an explanation using evidence to describe how natural selection leads to adaptation in a population.

Independent Practice Teacher Answer Key

  1. 1. Genetic variation occurs through mutation or sexual reproduction, which create differences in the genes of individuals.
  2. 2. Because more offspring are produced than the environment can support, individuals must compete for limited resources like food and space to survive and reproduce.
  3. 3. Organisms that are better able to obtain resources or avoid predators are more likely to survive and reproduce, while others may die or fail to reproduce.
  4. 4. The potential for many offspring creates competition; genetic variation provides different traits; competition selects for individuals with advantageous traits; these individuals reproduce more, causing those traits to become more common and the population to evolve.
  5. 5. Natural selection occurs because individuals with traits better suited to their environment survive and reproduce more. Over generations, these advantageous traits increase in frequency, causing the population to become better adapted to its environment.

Guiding Questions

  • What causes species to change over time?
  • How does genetic variation arise and affect survival?
  • Why is competition important in natural selection?
  • How do better-adapted organisms influence evolution?
  • How can we use evidence to explain evolutionary processes?

Common Misconceptions

  • Evolution happens because organisms want or need to change; actually, it results from natural processes like genetic variation and selection.
  • All individuals in a species are the same; in reality, genetic variation exists among individuals.
  • Resources are unlimited, so competition does not affect survival; actually, limited resources cause competition that influences survival.
  • Evolution happens quickly in a single generation; it occurs over many generations through changes in populations.

Differentiation

Support and Intervention

Provide sentence starters and graphic organizers to help structure explanations. Use visual models and diagrams to illustrate concepts. Allow group discussions to support understanding.

English-Language Learner Support

Use clear, simple language and define key vocabulary explicitly. Provide bilingual glossaries or visuals for key terms. Use sentence frames to support explanation construction.

Advanced and Extension

Challenge students to analyze data sets showing trait frequency changes over time. Encourage students to critique explanations using additional evidence. Have students design their own investigations or models of natural selection.

Assessment

  • Ask students to explain each of the four factors in their own words.
  • Have students analyze a model or data set and identify evidence of natural selection.
  • Use exit tickets where students list the four factors and give an example of each.
  • List the four factors that drive evolution.
  • Explain how genetic variation affects survival in a population.
  • Write a detailed explanation of how natural selection leads to adaptation using evidence from a case study.
  • Create a presentation explaining the four factors of evolution with examples.

Answer Guide

  • What causes genetic variation in a species?
    Answer: Mutation and sexual reproduction cause genetic variation by creating differences in individuals' genes.
  • Why does producing many offspring lead to competition?
    Answer: Because resources are limited, more offspring than can survive must compete for food, space, and mates.
  • How does competition affect survival?
    Answer: Individuals better able to compete for resources survive and reproduce more than others.
  • How do the four factors of evolution interact?
    Answer: Population growth creates competition; genetic variation provides traits; competition selects for advantageous traits; these traits increase in the population over time.
  • How does natural selection cause adaptation?
    Answer: Natural selection favors organisms with advantageous traits, increasing those traits in the population and leading to adaptation.

Real-Life Application

Encourage students to observe local plants or animals and consider how their traits might help them survive and reproduce in their environment. Discuss these observations with family members.

Homework or Home Connection

  • Encourage students to observe local plants or animals and consider how their traits might help them survive and reproduce in their environment. Discuss these observations with family members.

Lesson Summary

Evolution occurs because species can produce many offspring, but individuals vary genetically due to mutation and sexual reproduction. These individuals compete for limited resources, and those better adapted to their environment survive and reproduce more successfully. Over time, this natural selection process causes populations to change and adapt, which is the essence of evolution.

Teacher Notes

Use the exact standards alignment and retrieved-source provenance stored with this enrichment.

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