The effects of interspecific Y chromosome replacements on hybrid sterility within the Drosophila simulans clade.
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.
Johnson
N A
NA
Department of Ecology and Evolution, University of Chicago, Illinois 60637.
Hollocher
H
H
Noonburg
E
E
Wu
C I
CI
D000818:Animals; D003433:Crosses, Genetic; D004330:Drosophila / Q000235:genetics* / Q000502:physiology; D005260:Female; D005298:Fertility / Q000235:genetics*; D005838:Genotype; D007248:Infertility, Male / Q000235:genetics; D008136:Longevity / Q000235:genetics; D008297:Male; D013094:Spermatozoa / Q000502:physiology; D014998:Y Chromosome