Reproduction and population variation are central to understanding how inherited traits pass between generations and how populations change over time. This Grade 7 science worksheet explores sexual and asexual reproduction, inherited variation, natural selection, and selective breeding through examples that connect genetic differences with survival and reproduction.

Students examine why offspring produced through sexual reproduction often have different combinations of inherited traits, while offspring from asexual reproduction are generally genetically similar to their parent. They also consider how mutations can introduce differences and why some variation results from environmental influences rather than genetic differences. These distinctions provide the foundation for explaining how populations respond to changing conditions across generations.

Explore how populations change

The reading passage introduces the relationship between inherited variation and reproductive success. Students apply these ideas to situations involving insects with different colours on dark tree bark, plants with different fruit characteristics, and changes in the frequency of inherited traits within a population.

The worksheet also distinguishes natural selection from selective breeding. Students consider how environmental conditions influence which organisms survive and reproduce, compared with how breeders deliberately choose organisms with desired characteristics. The examples reinforce that individuals do not develop new inherited traits simply because they need them; existing variation influences which traits may become more common over generations.

Skills and activities

This reproduction and natural selection practice resource combines several ways for students to demonstrate their understanding:

• Multiple-choice questions ask students to apply concepts of reproduction, inherited variation, survival, trait frequency, and selective breeding to specific situations.
• True-or-false statements address common misconceptions about inheritance, asexual reproduction, and how traits change in populations.
• Short-answer responses require students to compare reproductive processes, explain how advantageous inherited traits can become more common, and justify why a farmer's deliberate plant selection is selective breeding.
• A labeled diagram and categorization activity provide additional opportunities to organize and represent information about the topic.
• A short-note activity gives students an opportunity to record relevant ideas in their own words.

What is included

• Printable Grade 7 science worksheet with student note-taking lines at the bottom.
• Separate PDF answer key for checking student responses.
• Teacher Guide included in the answer key PDF, with learning objectives, teaching tips, discussion questions, and common mistakes.

Classroom use

Use this Grade 7 reproduction worksheet after introducing inheritance and population variation, as guided classroom practice, independent work, a review activity, or a check of student understanding. The reading passage establishes the key concepts before students apply them to examples and explain their reasoning. The answer key supports efficient response checking, while the Teacher Guide offers discussion prompts and reminders about misconceptions that may need clarification.

For teachers covering reproduction, inheritance, and classification within a broader Texas Grade 7 science sequence, this resource keeps the focus on the relationship between inherited differences, reproductive success, and changes in populations. Students practise distinguishing environmental selection from human-directed breeding and explaining how trait frequencies can shift over successive generations.