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Anth. 105 Human Species – Lab 2 ReportEmily Chiu10/16/17IntroductionEvolution occurs when the alleles in the population change over time, usually over the course of many generations. Either new alleles arise or the existing alleles become more or less common There are four forces of evolution—mutation, genetic flow, genetic drift, or natural selection.Mutations are new genetic sequences that were not in the parents and new alleles arise through the changes in DNA, producing new variation. Therefore, more allele frequencies arise. Genetic flows are alleles that are exchanged between populations. Diversity increases, causing allele frequencies to increase as more come into the population. Genetic drift causes random changes in the frequency of alleles in a population. Alleles can be lost through random chance and therefore loses diversity in the population or they can be fixed in the population. Natural selection causes alleles that improve fitness to become more common.In this project, we investigated one of the four types of evolution and how they affect the allele frequencies. In particular, I had investigated how genetic drift affects allele frequencies based on changes in the population size. This was investigated using the computer stimulation program, “Populations Genetics Stimulator”. We tested different population sizes to see if they had contributed towards the change in allele frequencies. HypothesisI hypothesized that genetic drift will have a greater effect on allele frequency in smaller populations and larger populations will have lower effect on allele frequencies.