Mutation, natural selection and population diversity are the focus of this Grade 10 Science worksheet on DNA, inheritance and evolutionary change. Students investigate how mutations introduce genetic variation, why environmental conditions influence which traits are advantageous, and how inherited characteristics become more or less common in populations over generations.

The reading passage establishes an important distinction: organisms do not develop mutations because they need particular features. Instead, mutations create genetic changes, and natural selection influences which inherited variations become more common under particular environmental conditions. Students use this foundation to examine how populations change and why biodiversity can be affected by both natural processes and human decisions.

From genetic variation to evolutionary change

The lesson connects changes in DNA with larger patterns in populations. Students explore how environmental pressures influence reproductive success, how separated populations can develop different inherited characteristics, and how these changes can contribute to adaptive radiation.

Key concepts and vocabulary include:

• Mutations and mutagens: How DNA changes arise during copying or following exposure to certain chemicals or radiation.
• Inherited genetic variation: Why mutations in cells that contribute genetic material to offspring can introduce new variation.
• Natural selection: How advantageous inherited traits can become more common when their carriers leave more offspring.
• Environmental selection pressures: Why a mutation may be helpful in one environment but not another.
• Population diversity: How adaptive radiation, invasive species, environmental change and extinction influence populations.
• Selective breeding: How human choices about reproduction change inherited characteristics and raise ethical considerations.

Apply evolutionary concepts to scientific examples

Multiple-choice questions ask students to interpret situations involving mutations, changing food availability, bird beak variation, invasive species and DNA comparisons. True-or-false statements reinforce the differences between mutation, natural selection and selective breeding.

Short-answer questions move beyond definitions. Students explain how mutations contribute to variation, describe how natural selection could change the frequency of an inherited feeding trait over generations, and consider what scientific evidence and ethical or environmental factors should inform decisions about invasive species control. A labeled diagram, categorizing activity and short-note task provide further opportunities to work with the lesson material.

Included resources for teaching and review

• ✔️ Grade 10 Science printable worksheet with a focused reading passage and student activities.
• ✔️ Student Notes lines at the bottom of the worksheet for recording important ideas.
• ✔️ Separate PDF answer key for checking completed work.
• ✔️ Teacher Guide within the answer key PDF, featuring Learning Objectives, Teaching Tips, Discussion Questions and Common Mistakes.

Classroom application

Use this natural selection and genetic variation practice during a Science 10 unit on DNA, inheritance and diversity. It works as a follow-up to teaching mutations and inherited traits, an independent lesson activity, or a review of evolutionary mechanisms. The examples also provide opportunities to discuss how scientists use fossils, DNA comparisons and observations to investigate evolutionary patterns and evaluate competing hypotheses.

For teachers, the separate answer key makes checking responses straightforward, while the accompanying guide provides discussion prompts and teaching support. Students are encouraged to connect biological evidence with population-level changes and communicate conclusions without overlooking uncertainty or ethical considerations.