Fly Phenotypes Lab Report

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1. Objective
The objective of this lab is to test whether the dominant phenotype in flies is actually straight wings red-eyed using data stimulated from the FlyLab software.
Hypothesis
The mode of inheritance in flies is that red eyed, straight winged flies are the wildtype characteristics that are autosomal dominant and white-eyed, vestigial wings are the mutated characteristics.
2. Methods
a. Performed a cross between a red-eyed straight winged female fly and a white-eyed, vestigial winged male.
b. Performed another cross between the F1 progeny and received 8 different phenotypes.
Based on the typically results of a dihybrid cross, the results of the phenotypes should have been in a 9:3:3:1 ratio. Meaning out of 10000 fly’s in total, 5625 should be red-eyed, straight winged, 1875 should be either red-eyed, vestigial winged, or white-eyed, straight winged, and 625 of the fly’s should be white- eyed, vestigial winged. And each of those results should be equally halved since those phenotypes are independent on sex.
After which, I used the
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This means that the actual phenotypes of the flies are out of the expected ratio, they vary from it.
4. Conclusion
In conclusion, this lab shows that especially in a large population, it is not necessarily accurate to state that the 9:3:3:1 ratio that usually appears when using a dihybrid cross will actually be observed. Because of a bigger population, this causes for more deviation from the initial hypothesis to appear. The chi-test helped to show that the initial hypothesis should be

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