Mutant fruit fly. Light micrograph (LM) of a mutant fruit fly of the species Drosophila melanogaster. This mutant lack fully developed wings. D. melanogaster has been used for many years in genetic studies because it is easy to raise in large numbers, reproduces rapidly, & many of its mutations are easy to spot under a low-powered light microscope. The adult flies are 2-3mm long. Magnification: x80 at 10cm wide