Genetic differentiation and natural hybridization between two morphological forms of the common woodlouse, Oniscus ascellus Linnaeus 1758
Article Abstract:
Natural hybridization and genetic differentiation have been studied in two morphological forms of Oniscus ascellus Linnaeus 1758, the common woodlouse. An allozyme study of five populations has been carried out to see whether the numerous populations with intermediate morphology came from hybridization. The woodlice can be placed in two categories based on morphology, male accessory genitalia being the features in question. Morphological intermediates exist and these variations have been used to define subspecies. At ten loci strong frequency differences between the two could be seen, but no loci had entirely fixed differences. Intermediate populations are of hybrid origin and substantial population substructuring seems to exist in the zone of contact.
Publication Name: Heredity
Subject: Biological sciences
ISSN: 0018-067X
Year: 1999
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Detecting linkage disequilibrium between a polymorphic marker locus and a trait locus in natural populations
Article Abstract:
Linkage disequilibrium between a trait locus and a polymorphic marker locus in natural populations and its detection are discussed. A novel statistical model has been developed to test for this disequilibrium using principles of analysis of variance of unbalanced data and analysis of regression involving data of nonnormal distribution with powers of the statistical test formulated as functions of census population size, allelic frequencies at the marker locus and the trait locus and other things with theoretical predictions of the power validated by extensive Monte Carlo simulations.
Publication Name: Heredity
Subject: Biological sciences
ISSN: 0018-067X
Year: 1998
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Estimating multilocus linkage disequilibria
Article Abstract:
Understanding hybrid populations and estimating multilocus linkage disequilibria are discussed. In hybrid populations the mixing of genetically distinct taxa can maintain strong associations between even unlinked genes. A simple method based on multivariate moments is used and a maximum likelihood method using the Metropolis algorithm is used. Both methods used performed well in testing against simulations with two or four loci. The study was intended to find some composite measure to give information about the process responsible for linkage disequilibrium.
Publication Name: Heredity
Subject: Biological sciences
ISSN: 0018-067X
Year: 2000
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