In this hands-on activity, students analyze the results of genetic crosses between stickleback fish with different traits. It complements the film Evolving Switches, Evolving Bodies.

The activity begins with watching a portion of the short film Evolving Switches, Evolving Bodies. Students then apply the principles of Mendelian genetics to analyze the results of genetic crosses between stickleback fish with different traits. Students use photos of actual research specimens (the F1 and F2 cards) to obtain their data; they will then analyze the data they collected along with additional data from the scientific literature. In the extension activity, students use chi-square analysis to determine the significance of their results.

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