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Genetics, Vol 123, 371-377, Copyright © 1989
INVESTIGATIONS |
Gross Genetic Dissection and Interaction of the Chromosomal Region 95E;96F of Drosophila melanogaster
C. Gonzalez, I. Molina, J. Casal and P. Ripoll
Present address and address for reprint requests: Department of Biochemistry, Imperial College, London SW7 2AZ, England.
Making use of deficiencies, inversions and translocations, we have genetically dissected the region 95E to 96F of Drosophila melanogaster. We localized cytologically the loci abnormal spindle (asp: 3-85.2: 96A20-25;96B1-10) and M(3)96C(2) (96C1;96C5). We have also found several new phenotypes associated with lesions in the 95E to 97B region: (1) Minute(3)96A (M(3)96A) is a haplo-insufficient phenotype of thin and short bristles presented by individuals deficient for the region 95E6-8;96A1-5. (2) abdominal-one reduced (aor) shows two different phenotypes associated with the distal breakpoint of In(3R)Ubx(7L) (89E;96A1-7). One is the increase of the Ubx phenotype, but its effect requires the presence of lesions in Ubx. The other phenotype is a drastic reduction or disappearance of the first abdominal segment. Both phenotypes might be due to lesions in the same gene. (3) metaphase arrest (mar) is associated with the breakpoint of the T(Y;3)B197 (96B1-10) and produces a phenotype typical of mitotic mutants with arrest of the cell cycle during prometaphase or metaphase. There is another region localized in 97B which interacts with asp: in a background homozygous for asp, three doses of this region enhance the asp phenotype.
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