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Online Lessons for Teachers: Learning Evolution


How Does Evolution Work?

Back to LESSON 4

Activity 1: Breeding Bunnies

Activity 1: Teacher Notes

Activity 2: Teacher Notes

Materials You'll Need:


Flashy Fish: Data form (pdf)


Flashy Fish: Discussion Questions (pdf)

Activity 2: Flashy Fish

Professor John Endler traveled to Trinidad in the 1970s to study wild guppies. The guppies live in small streams that flow down the mountains from pool to pool. In this activity, you will take part in an online simulation of Endler's work. You will collect data, formulate a hypothesis, and run a series of experiments. You will find out about the interplay between natural selection and sexual selection in this wild population of guppies.



Print the Flashy Fish: Data form (pdf) and the Flashy Fish: Discussion Questions (pdf), or get them from your teacher.


Launch the Sex and the Single Guppy Web activity.

 Screen grab from the Web activity Sex and the Single Guppy.

Sex and the Single Guppy


Select "I'm ready to find out."


Read the text, and click on the pools to investigate the guppy stream more closely.


Then click on "What causes guppy color variation?" Select one of the hypotheses or create your own, and record it on the data form.


Visit the Guppy Gallery. Read about the different types of guppies, their predators, and their habitats.


Click on "simulation." Proceed with the simulation by creating and carrying out a field experiment to gather data to test your hypothesis. Record your data on the form. (You may need to alter your hypothesis if the data does not support it.)


Answer the questions on the Data form. Think about the Discussion Questions and be prepared to discuss your hypothesis, your experiment, and your explanations with the class.


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