Ok, first, for the intro, I would include a brief background on why the fruit fly is a model organism to study genetics(short life cycle, tons of offspring, etc.). Then I would include references to papers that discuss the traits you studied. For example, if eye color was a trait you examined, then punch in the specific eye colors you encountered in a journal search engine and pick out what you think has relevance. By relevance I mean is the trait associated with increased fitness, or decreased fitness, etc.. You should also talk about what data you would get if your hypothesis was to be supported. This should be the majority of your report. You are carrying out experiments that were being published before your professors were probably born, so just put down a good line of thought as to why any of the data you collected is relevant.
For the data, include your chi-square test(s) (multiple, most likely, as you need to do one seperately for males, females, and all). Also include the p-values and degrees of freedom. Then in your discussion talk about why your hypothesis was falsified/supported based on the p-values.
For your discussion, of course talk about your hypothesis and whether or not it was supported. Most likely, your hypothesis shouldn't be supported. Then talk about the genetic system that you think is responsible in your fruit flies, then why you think that, and then what kind of experiment could support your hypothesis along with the expected results from that experiment that would support your new hypothesis. For example, think about linkage, sex-linkage, along with the number of alleles involved, and the type of assortment that may be going on. The most likely proposed experiment will be a testcross, but it may not be in your case. If, by some chance, your original hypothesis is supported, discuss the implications of the genetic system your flies have, and if further experiments could lend support.
Ok, that's it, and I have to leave work now, so good luck!
