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In order to carry out a genetic and biochemical analysis of pteridin pathway eye colour loci, sixteen strains of five eye colour mutants of  Drosophila melanogaster  (2 dke, 7 sf. 3 se, 3 Hn r  and 1 bw) from natural populations were used. Four EMS mutagenesis experiments were carried out to produce induced mutants of the same loci. 54 mutants (mosaics and completes) were obtained but only 7 (4 sf, 1 bw, 1 Hn r  and I dke) could be isolated. The 40.48% of the mutations were mosaics. The percentage of mutants appeared during the four first days (85.19%) was significatively higher to the percentage of mutants appeared during the four following (14.18%). Viabilities of EMS-induced mutants were similar to that of the natural ones. For the induced mutants viability at 25°C was higher than at 16°C and heterozygotes had a higher Viability than mutant homozygotes. The low mutagenesis frequencies and the lack of some metabolites for Hn r  and se mutants suggest an important role of these mutants in the pteridine pathway.

Mutagenesis at Five Pteridine Pathway Loci In Drosophila melanogaster: Genetic and Biochemical Characterization