Bio. 315 Assignment 11.docx

4g with water 18ml and a pinch of yeast after the

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food solution (3.4g) with water (18mL) and a pinch of yeast after the mixture set. The fly groups consisted of G with a phenotype of red eyes, long wings, and a short light-colored body, and A with a phenotype of red eyes, long wings, and a short dark-colored body. The differing phenotype was the body color of the fly. We placed five females and five males from each group into one vial labeled G-A, and ten females and ten males from G into their own vial labeled G. For three weeks, we counted the population of each vial to compare with one another. To count the flies, we dipped a wand into a bottle of FlyNap to insert in the vial, rendering them unconscious and malleable for counting.
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Results and Discussion Table 1 contains the population size per week per vial Week G-A G-G 1 73 55 2 97 103 3 42 63
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The G-G fly population was larger than the G-A colony for two of the three weeks. After conducting a paired t-test with the data collected, we obtained a p-value of .816. We chose this test because a population standard deviation is not known and we are testing the mean difference, with degrees of freedom being one. A paired t-test determines if the mean difference between the two observed sets of data deviates significantly from zero. A positive mean difference suggests that Drosophila melanogaster prefer to mate with the same phenotype, a negative mean difference suggests a preference to a different phenotype, and mean difference of zero suggests no preference. The null hypothesis is there is no preference, and the alternate hypothesis is preference to mate with same phenotype. When compared to the standard significance level of 0.05, we determined that the data does not deviate significantly. There is not sufficient evidence to support the claim that Drosophila melanogaster prefer to mate with the same phenotype, therefore we state our finding to be there is no phenotypical mating preference for Drosophila melanogaster .
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  • Spring '14
  • BarrieD.Robison
  • Statistics, Statistical hypothesis testing

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