Biology lesson plan: Trait distributions and statistics
Topic: 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 (HS-LS4-3). Adjust the settings, then copy the prompt.
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Planning notes for this lesson
Prerequisite skills to check: natural selection and adaptation (HS-LS4-4); percentages and proportions; reading bar graphs and histograms.
Warm-up idea: Show two bar graphs of shell color in a snail population, one from before and one from ten generations after the habitat changed. Ask: what percentage of snails had dark shells each time, and what could explain the shift?
Exit ticket idea: Students calculate the percentage of a population with a trait in two or three generations from a small data table, graph the shift, and write a short explanation using that evidence for why the advantageous trait increased in proportion.
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