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Diagnostic methods were used to identify and quantify Myxobolus cerebralis, a myxozoan parasite of salmonid fish. In this study, 7-week-old, pathogen-free rainbow trout (Oncorhynchus mykiss) were experimentally infected with M. cerebralis and at 7 months postinfection were evaluated with 5 diagnostic assays: 1) pepsin-trypsin digest (PTD) to detect and(More)
The dynamics of gametic frequency change have been analyzed in two experimental plant populations. Individual plants were scored for their genotype at four enzyme loci, and four-locus joint gametic frequencies were estimated from the genotypic data over generations. Striking correlations developed in allelic state over loci, including correlations between(More)
Viability and fertility components of selection associated with linkage blocks marked by four electrophoretically detectable loci were estimated in an experimental population of barley [Composite Cross V (CCV)]. The intensity of selection affecting the distribution of pollen types in the outcross pool was also estimated and comparisons were made between the(More)
A multilocus method of estimating mating system parameters in populations is presented that recovers information from classification over multiple loci that single-locus estimators do not detect. It is shown that the multilocus estimator provides a standard of reference (null hypothesis) that can be useful in analyzing the effects of factors such as(More)
Two populations of Avena barbata have been sampled intensively and allelic frequencies have been determined on a fine grid for six enzyme loci. The distribution of alleles among microniches within the location occupied by one of these populations (CSA-1) was correlated with environment following patterns of macro- and microdifferentiation previously(More)
Collections from 31 populations of A. barbata from diverse habitats in Israel were assayed electrophoretically for seven enzyme systems. Phenotype frequencies were scored in nine enzyme zones, probably representing 27 loci, to determine isozyme variability within and among populations. Many different isozyme phenotypes were found in all of the populations;(More)
An analysis is presented of the reproductive cycle in an experimental population of barley. The experimental design included growing three different generations of the population in the same year and environment, thus permitting an assessment of the mating system at three stages in the evolutionary history of the population, unconfounded by environmental(More)
Twelve U.S. Corn Belt open-pollinated and five adapted exotic populations of maize (Zea mays L.) were assayed for allozyme (allele) variation at 13 enzyme marker loci. Extensive allozyme variability was observed in all populations studied. No locus was monomorphic over all populations. Each of the lociIdh2, Got1, Mdh2, Pgd1, andPgd2 expressed two allozymes(More)
Genotypes of 68,230 individuals taken from 10 generations (F(4)-F(6), F(14)-F(17), F(24)-F(26)) of an experimental population of barley were determined for four esterase loci. The results show that frequencies of gametic ditypes changed significantly over generations and that striking gametic phase disequilibrium developed within a few generations for each(More)
Randomness of fertilization was studied in an open-pollinated population of maize (Zea mays L.) through allozyme assays of seedlings from open-pollinated seeds produced on both tasseled and detasseled plants. Mixed-mating-model estimates of the amount of outcrossing (t) were not significantly different from t = 1.00 for four enzyme loci ( Adh1, Idh2, Got1(More)