Summary
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1.
Gynandromorphs were recovered fromIn(1) X c2,w vC/y Hw f 36a females. The distribution and frequency of the adult male and female areas indicate a very early loss of theIn(1) X c2,w vC chromosome. An analysis of mosaicism of the dorsal thoracic structures was carried out in order to derive a morphogenetic map of the location of their presumptive cells. It was constructed using 12 landmarks in the notum, 16 in the wing surface, the humerus and the haltere.
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2.
By several methods, the minimal number of cells populating the dorsal mesothoracic anlage was estimated to be about 40.
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3.
A map of the distances in trichomes—adult cells—between landmarks in the notum and the wing is presented. A comparison of the morphogenetic map and the adult map shows regional differences in growth. Whereas in the notum growth is isodiametrical, in the wing growth is preferentially along the proximo-distal axis of the anlage. However, the calculated mean mitotic rate is the same in both wing and notum.
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4.
Mosaicism in the notum is undetermined with respect to the adult structures. In the wing a virtual line along vein IV separates two wing regions, anterior and posterior, with different morphogenetic characteristics.
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5.
Possible morphogenetic mechanisms controlling the mesothoracic disc development are discussed.
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Ripoll, P. The embryonic organization of the imaginal wing disc ofDrosophila melanogaster . W. Roux' Archiv f. Entwicklungsmechanik 169, 200–215 (1972). https://doi.org/10.1007/BF00582553
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DOI: https://doi.org/10.1007/BF00582553