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Lesson 2
Are All Radish Plants (and Snails) the Same?
Big Idea: Although individuals in a population have similar traits, there is variation from one individual to another.
Activity: Working in small groups, students observe and describe one trait in a population of plants (the length of radish rootlets) and one in a population of animals (the whorl color on snail shells). They discuss situations in which a particular trait variant (e.g., shorter rootlet, darker whorls) might be helpful, harmful, or neutral to an individual’s capacity for survival and reproduction.
Materials to Have Ready
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5 petri dishes
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50 radish seeds
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Roll of paper towels
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5 plastic ziploc bags or plastic wrap to put the petri dishes in
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18 snail shells
Video Overview (2:06)

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