Molecular Biology and Evolution 19:347-351 (2002)
© 2002 Society for Molecular Biology and Evolution
Evidence for Selection at Multiple Allozyme Loci Across a Mussel Hybrid Zone
Department of Biology, P.O. Box 90338, Duke University, Durham
The frequency and strength with which selection shapes patterns of genetic variation is unknown. Whereas all loci should be roughly equally affected by demography and population history, selected loci may exhibit increased or decreased genetic differentiation relative to neutral loci (Cavalli-Sforza 1966
). Thus, one way to test for selection on a specific category of loci is to compare geographic differentiation of this particular category relative to a category presumed to be neutrally evolving (McDonald 1994
; McDonald, Verrelli, and Geyer 1996
). A number of recent studies have followed this approach, in particular comparing patterns of genetic differentiation at allozyme to nonallozyme loci. Where discordances between allozymes and other nuclear markers have been reported, less genetic partitioning has been observed for allozymes, consistent with balancing selection reducing differences among geographical populations (e.g., Karl and Avise 1992
; Pogson, Mesa, and Boutilier 1995
; Latta and Mitton 1997
). Here,
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