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Name: Period: Online Lab - Flashy Fish: Sex and the Single Guppy Purpose: to examine the role of multiple selective pressures on the evolution of guppy populations. Google “Sex and the Single Guppy” and open the first website. Read the introduction. Look at the “Guppy Gallery” and click on each of the fish to see more information on them. Look at the scientific name of each, which tells you the species it is in. 1) Are all of the fish the same or different species? Quickly click through the tabs on the bottom right of the activity to see information on predators and the habitat these guppies inhabit. Click on the “I’m ready to find out” link and read about Endler’s discovery. 2) Was what Endler found out from his guppy research important for evolutionary biology? If so why? Click on the numbers next to each pool to see what is in it. Click on the “what causes guppy color variation?” and read some hypotheses about color variation and change of abundance over time. Set up and run one of the possible experiments for TEN generations (this may take a few minutes). Record the class data in the table below. Repeat for each scenario, nine total. Table 1: Class Data for Flashy Fish Online Experiment 10 2 Mostly Bright Rivulus, Acara 10 3 Mostly Bright Rivulus, Acara, Ciclid 10 Mostly Drab (average) 0 4 Mostly Drab Rivulus 10 5 Mostly Drab Rivulus, Acara 10 6 Mostly Drab Rivulus, Acara, Ciclid 10 Even Mix (average) 0 7 Even Mix Rivulus 10 8 Even Mix Rivulus, Acara 10 9 Even Mix Rivulus, Acara, Ciclid 10 Drabbest % Mostly Bright Rivulus Drab % 1 Bright % 0 Brightest % Generations Predators Color Types Mostly Bright (average) Analysis: Graph your data. Results/Discussion: 3) Why do some guppies tend to be drabber than others (what is the advantage of being drab)? 4) Why do some guppies tend to be more colorful (what is the advantage of being colorful)? 5) Was the hypothesis that “predators are causing guppy populations to become more drab by preying on the most brightly colored individuals and eliminating them from the gene pool” supported by any or all of your data? If so what parts of your data and how did they support the hypothesis? 6) Was the hypothesis that “guppy populations are evolving to more closely match their environment” supported by any or all of your data? If so what parts of your data and how did they support the hypothesis? 7) Was the hypothesis that “guppy populations are evolving to stand out from their environment” supported by any or all of your data? If so what parts of your data and how did they support the hypothesis? 8) Was the hypothesis that “female guppies are choosing to mate with the most brightly colored males, giving those males a higher probability of passing their genes to the next generation” supported by any or all of your data? If so what parts of your data and how did they support the hypothesis? 9) Explain the push and pull that the environment (sexual selection and predation) has on coloration of guppies in Endler’s pools. How did each affect the number of guppies of certain colors and what was the result of both of them acting at the same time? This should probably be a long paragraph to two paragraphs done on a separate piece of paper.