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Originally published as Genetics Published Articles Ahead of Print on March 17, 2006.
Genetics, Vol. 173, 1145-1155, June 2006, Copyright © 2006
doi:10.1534/genetics.105.048199
Reinforcement and the Genetics of Hybrid Incompatibilities
Alan R. Lemmon1 and Mark Kirkpatrick
Section of Integrative Biology, University of Texas, Austin, Texas 78712
1 Corresponding author: Section of Integrative Biology, University of Texas, 1 University Station, C0930, Austin, TX 78712.
E-mail: alemmon{at}evotutor.org
Recent empirical studies suggest that genes involved in speciation are often sex-linked. We derive a general analytic model of reinforcement to study the effects of sex linkage on reinforcement under three forms of selection against hybrids: one-locus, two-locus, and ecological incompatibilities. We show that the pattern of sex linkage can have a large effect on the amount of reinforcement due to hybrid incompatibility. Sex linkage of genes involved in postzygotic isolation generally increases the strength of reinforcement, but only if genes involved in prezygotic isolation are also sex linked. We use exact simulations to test the accuracy of the approximation and find that qualitative predictions made assuming weak selection can hold when selection is strong. Our simulations also show that incompatibilities that evolve in allopatry by drift or weak selection are likely to be lost by swamping during secondary contact, even when selection against hybrids is strong.
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