The P element is a transposon found in this organism, which was studied by
 Alfred Sturtevant and first extensively bred by Charles W. Woodworth.
Synapse formation in this organism may be aided by the 38,000 isoforms of the gene encoding for its
 DSCAM cell adhesion molecule. A 1971 paper by Konopka and Benzer is about "clock mutants" of this
 organism. A receptor tyrosine kinase needed for the development of R7 cells in this organism's eye is
 encoded in the gene sevenless. The P element is a transposon found in this organism, which was studied by
 Alfred Sturtevant and first extensively bred by Charles W. Woodworth. The presence of bar eyes and
 notches in the wings of this organism are linked traits. For 10 points, name this model organism, a type of
 fly used in experiments by Thomas Hunt Morgan.
Synapse formation in this organism may be aided by the 38,000 isoforms of the gene encoding for its
 DSCAM cell adhesion molecule.
{Drosophila} melanogaster [or {fruit} fly; or {D.} melanogaster]