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The aspartate aminotransferases (designated GOT1 and GOT2) are two enzymes of Drosophila melanogaster for which naturally occurring electrophoretic variants were not found. There is an electrophoretic difference between D. melanogaster and D. simulans. Since the F1 hybrid offspring of these species are sterile, a genetic analysis of the ordinary type cannot be done on differences between the two species. A method was devised to make "partial hybrids" in which one chromosome arm is homozygous for melanogaster genes in an otherwise hybrid background. By using this method, Got1 was localized to 2R and Got2 to 2L. Once a gene can be assigned to a chromosome, it may be followed in crossing schemes and mutations from mutagen treatments may be looked for. At the locus of Got1 a mutation with low activity was recovered and designated Got1lo. It was located at a genetic map position of 75 on 2R. A Got2 mutant with a greater migration to the anode was recovered and designated Got2J. It was located at a genetic map position of 3.0, and in the salivary chromosome was between 22B1 and 22B4 inclusive.

genetics

GENETIC ANALYSIS OF ASPARTATE AMINOTRANSFERASE ISOZYMES FROM HYBRIDS BETWEEN <i>DROSOPHILA MELANOGASTER</i> AND <i>DROSOPHILA SIMULANS</i> AND MUTAGEN-INDUCED ISOZYME VARIANTS

GENETIC ANALYSIS OF ASPARTATE AMINOTRANSFERASE ISOZYMES FROM HYBRIDS BETWEEN DROSOPHILA MELANOGASTER AND DROSOPHILA SIMULANS AND MUTAGEN-INDUCED ISOZYME VARIANTS