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
5 petri dishes
50 radish seeds
Roll of paper towels
5 plastic ziploc bags or plastic wrap to put the petri dishes in
18 snail shells