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doi:10.1534/genetics.105.048199
A more recent version of this article appeared on June 1, 2006.
REGULAR RESEARCH PAPERS |
Reinforcement and the genetics of hybrid incompatibilities
Alan R Lemmon 1* and Mark Kirkpatrick 1
1 University of Texas
* To whom correspondence should be addressed. E-mail: alemmon{at}evotutor.org.
Submitted on July 13, 2005
Revised on September 2, 2005
Accepted on 14 March 2006
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.
Key Words: hybridization, incompatibility, reinforcement, sex-linkage, speciation
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