[Developmental studies on gynandromorphs ofDrosophila melanogaster : II. The morphogenetic fate map].

The distribution of XX- and XO-areas within the cuticle and in the internal organs was examined in 355 adult gynandromorphs of the genotypeR(1)2,In(1)w /y w sn lz mal, whereby XO-areas could be recognized by the phenotypes of the recessive alleles on the rod-X-chromosome.The percentage of gynandromorphs in which selected pairs of structures show different genotypes is taken as a measurement (in sturt-units) for the distance between the presumptive areas of these structures in early developmental stages. The calculated distances between cuticular structures (Table 2) agree well with those reported by Hotta and Benzer (1972). The structures of internal organs were therefore localized in the fate map of Hotta and Benzer. The resulting morphogenetic map (Fig. 1) is discussed in comparison with Poulson's embryonic fate map.