lab2.docx - Anth 105 Human Species u2013 Lab 2 Report...

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Anth. 105 Human Species – Lab 2 Report Introduction In Lab 1, we are using computer simulation to investigate one of the four forces of evolution. The four forces of evolution are mutation, genetic drift, gene flow, and natural selection. In mutation, new alleles arise through changes in DNA. There are three different mutation conditions. Substitution is when a gene is replaced, insertion is when a gene is inserted, deletion is when base pairs are deleted. Mutation increases diversity in a population. Genetic drift is when alleles are lost through random chance. Genetic drift decreases diversity in a population. Gene flow is when alleles are exchanged between populations, increasing diversity in a population. Natural selection is when alleles that improve fitness in a population become more common. There are three conditions for natural selection. There must be variation in the trait, the trait must be heritable (shaped by genes), and variation in the trait must affect fitness. The effect of this on diversity depends, because it is not random. In this project, we investigated natural selection in a fictitious population of 20 blue organisms in the Evolution Lab. The simulation focuses on mutation as the cause of variation of

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