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Anth. 105 Human Species – Lab 2 ReportEdwin Wu3/14/18IntroductionIn Lab 2, we are using computer simulation to investigate the four forces of evolution. The four forces of evolution are genetic drift, gene flow, natural selection, and mutation. Genetic drift is when alleles are lost through a random chance. This could mean a part of a population with a specific gene died to a natural disaster, which in case decreases diversity. Mutation is when new alleles arise through changes in DNA, because of these changes, diversity increases. Gene flow happens when alleles are exchanged between populations. The exchange of different alleles of the populations create offspring with a combination of the two different alleles, increasing diversity. Last force of evolution is natural selection, which is when alleles that improve fitness become more common. This means that a certain number of population lived on and reproduced offspring with the same allele since their allele of that trait proved to more beneficial at that time. The effects on alleles can either increase diversity or decrease it.For this Lab, we investigated the effects of natural selection using a computer simulation program called Darwin’s Finches. The simulation provides the tools to control certain aspects that play into natural selection, by giving us control on what variables can be changed to affect the frequencies of alleles. In the simulation, the frequencies are calculated through formulas