Determination and differentiation is easy to observe during embryogenesis and larval imaginal disc development but not during metamorphosis, because the pupae are opaque, the larval tissue is undergoing histolysis and the developing imaginal tissue is fragile.
At the wandering third instar larval stage, PB is expressed in the labial imaginal disc but not in the eye antennal imaginal disc that harbors the primordia for the maxillary palpus .
In wild type T2/T3 imaginal discs, Ubx is expressed throughout the T3 haltere and T3 leg imaginal discs of third instar larvae (Figures 3(a) and 3(d)), but it shows little expression in the T2 wing imaginal disc.
Preparation and Double-Labelling of Imaginal Discs. Larval tissues were dissected in PBS and fixed in 4% formaldehyde for 20 minutes.
Boundaries in the Drosophila wing imaginal disc
organize vein-specific genetic programs.
Former principal dancer Julia Adam raised hopes with imaginal disc
, a twelve-dancer romp to a neo-baroque score by the congenial Matthew Pierce; Adam's reputation for quirky, if not subversive, movement survived in her Irish dance steps for the men and conga line for the women.
Development of the eye-antenna imaginal disc
and morphogenesis of the adult head in Drosophila melanogaster.
Inside the pilidium, the juvenile develops from a series of epidermal invaginations in the larval body, called imaginal discs
. The discs grow and fuse around the larval gut over the course of weeks to months in the plankton.
However, morphological traits derived from several developmental pathways, such as fly wings that are derived from different imaginal discs
(Gehring and Nothiger 1973; Cowley and Atchley 1990), may be nearly as developmentally complex as some life history traits.
In the pupal period, there is destruction and reorganization of most larval tissues, but also the formation de novo of part of the adult tissues from imaginal discs
(i.e., undifferentiated cells set apart during larval development).