Anth 105 Lab 2.docx - Anth 105 Human Species Lab 2 Report...

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Anth. 105 Human Species – Lab 2 Report Sadiyah Deane March 15, 2018 Introduction- Evolution or the change of alleles in a population over time occur by four possible forces. Mutation, which can further be broken down by substitution, insertion, and deletion, allow new alleles to arise in a population due to changes in DNA. Genetic Drift is another form of evolution where alleles are lost through random chance. Gene Flow, unlike Genetic Drift, allows alleles to be exchanged between populations. Lastly evolution can be prompted by Natural Selection where alleles that improve fitness become common in a population. In this project, we used a computer simulation to investigate natural selection as a force of evolution. For my lab, I used the computer simulation ‘Evolution Lab’ which examined the effects of selection strength and mutation rate on a fictional organism’s neck segment length. To test my hypothesis on the effect of natural selection on neck length frequency I conducted three trials with varying settings of selection strength and mutation rates. Hypothesis- 1. A higher mutation rate would lead to the population having a larger variety in phenotype frequency. Methods- To prove/disprove my hypothesis I conducted three different trials using the online evolution simulator ‘Evolution lab’( ). In this program a population of 20 fictional organisms were used to determine how natural selection impacted their phenotype neck segment length over a period of 100 cycles. The organisms could have only 1-4 neck segments, the larger the number the longer their necks would be. In each trial

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