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White And Sepia Eyes Lab Report

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Hypothesis IF white eyes are an autosomal dominant trait AND we cross male flies with autosomal recessive sepia eyes with female flies with white eyes THEN the second generation (F2) offspring will all have white eyes. This hypothesis assumes that both white and sepia eyes are an autosomal gene and that there will be no other genes present that will affect the eye color. The hypothesis predicts that the F1 generation will have only the white eye phenotype, but will be carriers for sepia eyes. With each new generation, the variety of eye color should increase. Graph/Table of Results The purpose of this experiment was to determine how the color genotype is carried on the chromosome in the Drosophila melanogaster (fruit fly). The results of the first generation (F1) did not show what the hypothesis predicted. Only white eyes were supposed to be present, yet the F1 generation had a clear split between the generations with red eyed females and white eyed males (Table 1). There was no other eye color present for either sex. The F2 generation resulted in both male and female flies having either red, white, or sepia eyes (Fig. 1). …show more content…

F1 Drosophila melanogaster results of different eye colors are different from the observed and expected values. Breed 4 sepia eyed males with 4 white eyed females. F1 generation resulted in red eyed males and white eyed females. Chi squared test performed using the observed and expected values. Chi-squared is 10.98, critical value is 3.84 at 5% significance with 1 degree of freedom. n=53 Figure 1. F2 generation of Drosophila melanogaster males (A) and females (B) had a combination of red, white and sepia eyes. N= 22 for males, with 13 being white eyed, 2 sepia eyed and 7 red eyed. N= 31 for females, with 14 having white eyes, 4 having sepia eyes, and 13 having red

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