Collaborative Research: Extreme Discordance between Allozyme and Non-allozyme Introgression in Baltic Mussels. Selection on Allozymes?
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Evidence for selection at multiple allozyme loci across a mussel hybrid zone.
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 geograph...
متن کاملDirect selection on allozymes is not required to explain heterogeneity among marker loci across a Mytilus hybrid zone.
Unequal differentiation between two types of loci (allozyme and DNA markers) across a Mytilus hybrid zone has recently been claimed as evidence for direct selection on some allozyme loci. We provide here a counter-example: a noncoding DNA locus that exhibits as much differentiation as the incriminated allozymes do. The levels of genetic differentiation varied widely among both allozymes and non...
متن کاملNotes on a discrepancy in mitochondrial DNA and allozyme differentiation in a pond frog Rana nigromaculata.
Analyses of complete 1143-base pair sequence of the mitochondrial cytochrome b gene demonstrated a sister relationship between Japanese R. nigromaculata and Korean R. plancyichosenica, but not with Korean R. nigromaculata, while the allozyme data strongly supported the monophyly of the Korean and Japanese populations of R. nigromaculata. We surmise this discordance to be the result of the inher...
متن کاملLack of geographic variation in anonymous nuclear polymorphisms in the American oyster, Crassostrea virginica.
Comparing geographic variation of noncoding nuclear DNA polymorphisms, which presumably are neutral to natural selection, with geographic variation of allozymes is potentially a good way to detect the effects of selection on allozyme polymorphisms. A previous study of four anonymous nuclear markers in the American oyster, Crassostrea virginica, found dramatic differences in allele frequency bet...
متن کاملDiversifying Selection Underlies the Origin of Allozyme Polymorphism at the Phosphoglucose Isomerase Locus in Tigriopus californicus
The marine copepod Tigriopus californicus lives in intertidal rock pools along the Pacific coast, where it exhibits strong, temporally stable population genetic structure. Previous allozyme surveys have found high frequency private alleles among neighboring subpopulations, indicating that there is limited genetic exchange between populations. Here we evaluate the factors responsible for the div...
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تاریخ انتشار 2016