Cytogenetic analysis of three genetic sexing strains of Ceratitits capitata.
Polytene chromosomes of three genetic sexing strains of Ceratitis capitata were analyzed. The genetic sexing mechanism is based on a pupal color dimorphism (white-brown) and is the result of a reciprocal translocation between the Y chromosome and the autosome bearing the w locus (white pupal case). The analyzed polytene chromosomes were derived from two different pupal tissues, the orbital bristle and fat body cells. The Y chromosome is visible in both tissues, while the autosomes present a different banding pattern. Based on these features, the autosome breakpoints in the three Y; autosome translocations were mapped, and the homology of the translocated autosome in both tissues was established. In addition, the location of the break-points was compared to the stability of these three strains.
Joint FAO/IAEA Program, IAEA Laboratories, Entomology Unit, A-2444, Seibersdorf, Austria.
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Kerremans
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K
Bourtzis
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A
Zacharopoulou