LS1_Wk2_InLabWk10

LS1_Wk2_InLabWk10 - Life Science 1 Print and Bring to...

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Life Science 1 Print and Bring to Section Page 1 of 13 Evolution: Computer Simulation Experiment From the desktop screen, open MatLab . A screen will appear with three windows. In the command window (large window on the right), type “ls_startup” at the prompt to launch the natural selection simulation. Read the message that appears regarding the lab; after a short while (to ensure that you read the message) an “OK” button will appear, beginning the program. You will not need to work with the two smaller windows on the left: the directory and the command history window. From the main simulation startup screen, you will see the various options that you can control. You will see that for your population of dots, you can manipulate the initial average values of the four attributes discussed as well as the population size. You can also control food source availability and distribution. You will have 50 points to allocate to your various attributes to change the attributes of the initial population. Each improvement to your organism’s population average will cost you points. It is also possible to limit the change in an attribute. By ticking the “Control” box next to any attribute, the value of that attribute will be restricted from changing over the course of the simulation. This is helpful if you would like to see the effects of natural selection on one or two attributes only. You will also be able to control the amount of variation present in your population. Finally, you will be able to specify the number of generations the simulation should model.
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Life Science 1 Print and Bring to Section Page 2 of 13 Under the File menu, you will discover a CHEAT option, which will give you more points should you wish to allocate even more points than you are allowed. Selecting the CHEAT option will give you over 1000 extra points, so it will be evident that the super dots you have created are fake mutants. You will furthermore be unable to uncheat, meaning if you should want to return to the default number of points, you will have to restart the entire program (or manually constrain yourself to 50 points). When the parameters meet your satisfaction, select RUN from the File menu.
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Life Science 1 Print and Bring to Section Page 3 of 13 As the simulation runs, two windows will open, allowing you to observe the simulation in real time. Figure 1 shows the movement of the dots, and their interaction with the food sources. You will observe the dots moving around trying to capture as much food (green stars) as possible. At the end of each generation, the dead dots will be cleared out and the most successful survivors (those with the highest score based on how much food they acquired) will be able to repopulate the area.
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Life Science 1 Print and Bring to Section Page 4 of 13 While the simulation is running, a second window will track the mean values of the four attributes in real time. There is also a fifth attribute, called the ????? attribute, which is a
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This note was uploaded on 06/03/2011 for the course LS 1 taught by Professor Thomas during the Spring '05 term at UCLA.

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LS1_Wk2_InLabWk10 - Life Science 1 Print and Bring to...

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