Development in Genetic Mosaics of Aristapedia, a Homoeotic Mutant of DROSOPHILA MELANOGASTER

AUTOR(ES)

Postlethwait, J. H.

RESUMO

Development of the homoeotic mutation, aristapedia (ssa), was investigated by means of genetic mosaics. The wild-type alleles of aristapedia and the bristle markers yellow, singed, and forked were removed from cells at different times in development by X-ray induced somatic crossing-over. The phenotype of the resulting clones was examined in order to ascertain whether it was leg or antenna. The y sn f; ssa clones showed a leg phenotype if induced before the mid-third instar, but showed an antennal phenotype if induced after this time. Late non-expression of ssa may be due either to an influence of surrounding ss+ tissues on the small ssa clones, or to a persistence of the effect of ss+ for one or two cell generations after it is removed from a cell line.

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