HS-LS4-3
The standard
Apply concepts of statistics and probability to support explanations that organisms with an advantageous heritable trait tend to increase in proportion to organisms lacking this trait.
Next Generation Science Standards
What this standard means
Students need to use simple data, graphs, percentages, and probability to explain why a helpful inherited trait becomes more common in a population over time. They should connect survival or reproduction advantage to changes in trait proportions across generations.
Mastery looks like reading a data table or graph, spotting the trend, and explaining it with evidence, not just saying “they adapted.” Students often mix up individuals changing with populations changing. They may also describe the trait as “needed” or “chosen” instead of inherited and linked to better survival or reproduction.
Ways to teach it
- Hands-on: Use colored beads as insects, have students remove visible colors as predators, then graph color percentages over three generations.
- Prompt: Explain why a trait can become more common without any individual organism changing during its lifetime.
- Quick assessment: Give a small trait-frequency table across generations and ask students to identify the advantageous trait and cite two numbers.
- Real-world connection: Analyze antibiotic resistance data and explain why resistant bacteria increase after antibiotic use.
Plan a lesson for HS-LS4-3
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