Genetics, Vol 140, 201-206, Copyright © 1995


INVESTIGATIONS

Further Characterization of the Odysseus Locus of Hybrid Sterility in Drosophila: One Gene is Not Enough

D. E. Perez and C. I. Wu
Present address: Laboratory of Viral Carcinogenesis, National Cancer Institute, Frederick, MD 21702-1201.

Previously we mapped by genetical and molecular means a gene that contributes to hybrid-male sterility between Drosophila mauritiana and D. simulans to the cytological interval of 16D. In this report, we refine the mapping of this gene, Odysseus (Ods) and show that it can be delineated to a region the size of an average gene. We further demonstrate that, while Ods appears to be a discrete element, it requires other nearby gene(s) to be cointrogressed to confer full hybrid sterility effect. This observation is in agreement with the view that reproductive isolation between closely related species of Drosophila is usually caused by several genes of weak effect from the same species that interact strongly among themselves as well as with the foreign genetic background.


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