Mechanisms_datasheet Sp16 - Updated Life Sciences 1...

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Updated 4/12/16 1 Life Sciences 1: Mechanisms of Evolution Lab In-lab worksheet Part 1: Evolution: Population Genetics: Genetic Drift Read the description and instructions on the Random Genetic Drift simulation in the binder. Run the simulation twice with default settings, and make sure the “stop when fixed” button is ON. For each simulation trials, take note of how many populations are fixed for the bw allele, and in which populations (i.e., population #1-10) the bw allele became fixed. To determine the generation where 50% of the populations are fixed, find the point where the fifth population is fixed for one of the two alleles (either bw or non- bw ). Place your cursor on the line on the graph where the population becomes fixed (i.e., is at 1 or 0 on the y-axis), and the number of generations that have occurred at that point will appear on the x-axis. Trial Total # of population s fixed for bw Which population s are fixed for bw ? Generation where the first population is fixed for bw or non-bw Generation where five of the populations are fixed bw or non-bw Generation where all populations are fixed bw or non-bw N=10 1 2 N=20 1 2 N=80 1 2 1. What was the effect of increasing population size on time to fixation? Explain your results. 2. Since the simulation starts with 50% of the bw allele, what is the average number of populations that would become fixed for this allele? Explain your answer. 3. What is the effect of changing initial bw allele frequency on time to fixation? Explain your answer including data (either in table or figure format) collected from the simulation. You need to decide what parameters to change and what to use as a control in order to answer this question.
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Updated 4/12/16 2 Part 2: Evolution: Population Genetics: Random Effects Read the description and instructions on the Random Effects simulation. Bottleneck Click on “reset” a few times and watch the mainland allele frequency values. 1. Do they stay the same each time you hit reset?
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