Creating a Bottleneck Effect in an Ostrilope Population in the Sim Goal: In fewer than 30 generations, change the starting ostrilope population into a population of at least 70 individuals with low variation in color traits (4 traits or fewer). Do this without adding a predator. Do: Decide on a strategy to reduce the variation of the ostrilope population. Open the Natural Selection Simulation and open the mode: Color Change Mission. Try out your strategy by making any changes in either Build or Run. Use the histograms in Analyze or the Traits Histogram Window in Run to see if your strategy was successful. Tips: You can modify abiotic factors in Run at any time by pressing the Abiotic Factors icon in the lower-right corner of the screen. Do not make any changes to the starting ostrilope population settings. Return to Build and press REBUILD to reset the Sim to the default settings.

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Quick Answer Open the Natural Selection Simulation and open the mode: Color Change Mission. Increase the “Mutation Rate” to 10%, set the “Dispersal” to 100%, and set the “Focus” to 0%. Then, press “Run” and watch the histograms in Analyze or the Traits Histogram Window in Run. In fewer than 30 generations, you should have a population of at least 70 individuals with low variation in color traits (4 traits or fewer). Explanation To create a bottleneck effect in an ostrilope population in the Sim, the first step is to open the Natural Selection Simulation and open the mode: Color Change Mission. From here, you need to decide on a strategy to reduce the variation of the ostrilope population and then try it out by making any changes in either Build or Run. One potential strategy that could work is to increase the “Mutation Rate” to 10%, set the “Dispersal” to 100%, and set the “Focus” to 0%. This will cause all of the alleles to be randomly distributed throughout the population, reducing the variation in color traits. Then, press “Run” and watch the histograms in Analyze or the Traits Histogram Window in Run. In fewer than 30 generations, you should have a population of at least 70 individuals with low variation in color traits (4 traits or fewer). If this particular strategy does not work, you can always try again by making different changes in either Build or Run, or you can return to Build and press REBUILD to reset the Sim to the default settings.
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