anthp 105 lab 2.docx - Anthp 105 Human Species u2013 Lab 2...

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Anthp 105 Human Species – Lab 2 Report Introduction Evolution is the change in the genetic structure of a population and a change in allele frequencies in a population through time. Evolution occurs over multiple generations to a population, not just one individual. There are multiple forces of evolution that cause the differences in alleles, causing changes in populations. The four forces of evolution are mutation, genetic drift, gene flow, and natural selection. In mutation, new alleles arise through change in DNA; genetic drift is when alleles are lost through random chance; gene flow is when alleles are exchanged between populations; natural selection is when alleles that improve fitness become more common. In this lab, we investigated natural selection. Natural selection is the process by which populations adapt to their environment based on traits that improve fitness, which is the probability of producing surviving offspring. These traits are favored and then passed on to the new generation. To investigate this force of evolution we used the computer simulation Darwin’sFinches. In the simulation, the finches have 2 alleles types (A and B) which produce 3 phenotypes (short beaked, medium beaked, and long beaked). Finches with the genotype AA have long beaks, AB have medium beaks, and BB have short beaks. Which beaks are favored

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