Drosophila melanogaster. There should be 2 or 3 pgs on the features of this model organism and why it is used in research. Include things life cycles, ploidy, genetics, genome data etc. There should be 2-3 pgs on the specific research paper you chose to discuss. Why did you choose it? Again, try to get the main point and don't get overwhelmed with minute details! Remember, every statement (or groups of statements) in the essay but be cited / referenced. Whatever reference system you use, be consistent! Do not use quotations - paraphrase all content and cite it in the references. Quotes will be penalized by one letter grade. There should be a conclusion paragraph.