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Genetics, Vol 135, 443-453, Copyright © 1993
INVESTIGATIONS |
The Effects of Interspecific Y Chromosome Replacements on Hybrid Sterility Within the Drosophila simulans Clade
N. A. Johnson, H. Hollocher, E. Noonburg and C. I. Wu
Department of Ecology and Evolution, University of Chicago, Chicago, Illinois 60637
We attempted to introgress Y chromosomes between three sibling species of Drosophila: D. simulans, D. sechellia and D. mauritiana. Four D. sechellia Y chromosomes were introgressed into D. simulans without loss of fertility whereas the four reciprocal introgressions (D. simulans Y introgressed into D. sechellia) all result in sterility. Both reciprocal Y introgressions of D. simulans and D. mauritiana (four of each) also result in sterility. Compared with D. simulans males, the males with the D. sechellia Y chromosome in D. simulans background had lower productivity but only after multiple matings with virgin females. These males also were inferior compared with pure species males in sperm displacement and/or remating ability. The two different Y genotype males, however, were comparable in viability, longevity and mating success in female choice tests. We also use our results to estimate the effective number of autosomal loci interacting with X-linked genes to produce hybrid male sterility.
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