Abstract
Sixteen null-activity mutants were obtained for the acid phosphatase-1 system (3–101.1) in Drosophila melanogaster using ethylmethanesulfonate as the mutagen. They were selected by combining an electrophoretic analysis and a spot test assay for acid phosphatase which, together, allowed the screening of large numbers of mutagenized chromosomes. Five mutants were obtained by electrophoretic analysis alone, and an additional 11 were recovered when the spot test was used. Flies homozygous for three of the Acph-1 0 mutants were found to be viable and fertile. Also, the relative mutability of two allozyme loci and two genes whose effect is on adult morphology were examined.
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