Abstract
Development in two wing-scalloping mutants ( scalloped and vestigial) was analysed in mosaic flies. In strong alleles of these mutants the wings are reduced to vestiges. When a temperature-sensitive allele of scalloped was treated with heat pulses, particular wing areas were eliminated in a specific order. Homozygous mutant clones were made in heterozygous flies: Marginal clones in either the dorsal or ventral wing surface caused local scalloping, affecting both surfaces to the same extent. Internal Minute + clones survived well when surrounded by weaker Minute cells, but poorly when surrounded by normal Minute + cells. Large Minute + clones of either scalloped or vestigial could make distal parts that are never seen in the wings of mutant flies.
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