So you are doing a report,not an experiment? If so, you should consider writing about the different applications of these type of flies. It seems that they are the subject of many interesting projects.
They are being used in a genome sequencing project:
http://www.fruitfly.org/
These are the common fruit fly which are very easily bred and thus make easy test subjects in labs. This should be of interest-
"Drosophila melanogaster is the most studied organism in biological research, particularly in genetics and developmental biology. There are several reasons:
-It is small and easy to grow in the laboratory
-It has a short generation time (about 2 weeks) and high productivity (females can lay 500 eggs in 10 days)
-The mature larvae show giant chromosomes in the salivary glands called polytene chromosomes - "puffs" indicate regions of transcription and hence gene activity.
-It has only 4 pairs of chromosomes: 3 autosomal, and 1 sex.
-Males do not show meiotic recombination, facilitating genetic studies.
-Genetic transformation techniques have been available since 1987.
-Its compact genome was sequenced in 1998.[8] "
-Wikipedia
Hope it helps with your report!