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Dominance Effects (dominance + effects)
Selected AbstractsDominance Effects from Local Competitors: Setting Institutional Parameters for Employment Relations in Multinational Subsidiaries; a Case from the Spanish Supermarket SectorBRITISH JOURNAL OF INDUSTRIAL RELATIONS, Issue 4 2009Tony Royle Dominance effects are normally associated with multinational corporations (MNCs). However, we argue that a strong local competitor can create ,dominance effects' setting the institutional parameters for employment relations in multinational subsidiaries. Moreover such an effect can be persistent. In this case the Spanish-owned El Corte Inglés (ECI) used its power and influence to establish an employer's federation and two ,yellow unions'. These yellow unions infiltrated the French-owned MNC Carrefour and most of the Spanish supermarket sector by the early 1980s and continue to dominate collective bargaining rounds and works council elections, marginalizing the main independent trade unions. This has resulted in poor pay and working conditions and a lack of effective employee representation across most of the Spanish supermarket sector. The fact that Carrefour established an international framework agreement to observe union rights in 2001 has as yet not changed this situation. [source] RELATIVE CONTRIBUTION OF ADDITIVE, DOMINANCE, AND IMPRINTING EFFECTS TO PHENOTYPIC VARIATION IN BODY SIZE AND GROWTH BETWEEN DIVERGENT SELECTION LINES OF MICEEVOLUTION, Issue 5 2009Reinmar Hager Epigenetic effects attributed to genomic imprinting are increasingly recognized as an important source of variation in quantitative traits. However, little is known about their relative contribution to phenotypic variation compared to those of additive and dominance effects, and almost nothing about their role in phenotypic evolution. Here we address these questions by investigating the relative contribution of additive, dominance, and imprinting effects of quantitative trait loci (QTL) to variation in "early" and "late" body weight in an intercross of mice selected for divergent adult body weight. We identified 18 loci on 13 chromosomes; additive effects accounted for most of the phenotypic variation throughout development, and imprinting effects were always small. Genetic effects on early weight showed more dominance, less additive, and, surprisingly, less imprinting variation than that of late weight. The predominance of additivity of QTL effects on body weight follows the expectation that additive effects account for the evolutionary divergence between selection lines. We hypothesize that the appearance of more imprinting effects on late body weight may be a consequence of divergent selection on adult body weight, which may have indirectly selected for alleles showing partial imprinting effects due to their associated additive effects, highlighting a potential role of genomic imprinting in the response to selection. [source] Country-of-origin, localization, or dominance effect?HUMAN RESOURCE MANAGEMENT, Issue 4 2007An empirical investigation of HRM practices in foreign subsidiaries This article contributes to two recurring and very central debates in the international management literature: the convergence vs. divergence debate and the standardization vs. localization debate. Using a large-scale sample of multinationals headquartered in the United States, Japan, and Germany, as well as subsidiaries of multinationals from these three countries in the two other respective countries, we test the extent to which HRM practices in subsidiaries are characterized by country-of-origin, localization, and dominance effects. Our results show that overall the dominance effect is most important (i.e., subsidiary practices appear to converge to the dominant U.S. practices). Hence, our results lead to the rather surprising conclusion for what might be considered to be the most localized of functions,HRM,that convergence to a worldwide best practices model is clearly present. The lack of country-of-origin effects for Japanese and German multinationals leads us to a conclusion that is of significant theoretical as well as practical relevance. Multinationals might limit the export of country-of-origin practices to their core competences and converge to best practices in other areas. © 2007 Wiley Periodicals, Inc. [source] The distribution of QTL additive and dominance effects in porcine F2 crossesJOURNAL OF ANIMAL BREEDING AND GENETICS, Issue 3 2010J. Bennewitz Summary The present study used published quantitative trait loci (QTL) mapping data from three F2 crosses in pigs for 34 meat quality and carcass traits to derive the distribution of additive QTL effects as well as dominance coefficients. Dominance coefficients were calculated as the observed QTL dominance deviation divided by the absolute value of the observed QTL additive effect. The error variance of this ratio was approximated using the delta method. Mixtures of normal distributions (mixtures of normals) were fitted to the dominance coefficient using a modified EM-algorithm that considered the heterogeneous error variances of the data points. The results suggested clearly to fit one component which means that the dominance coefficients are normally distributed with an estimated mean (standard deviation) of 0.193 (0.312). For the additive effects mixtures of normals and a truncated exponential distribution were fitted. Two components were fitted by the mixtures of normals. The mixtures of normals did not predict enough QTL with small effects compared to the exponential distribution and to literature reports. The estimated rate parameter of the exponential distribution was 5.81 resulting in a mean effect of 0.172. [source] Linkage and QTL mapping for Sus scrofa chromosome 1JOURNAL OF ANIMAL BREEDING AND GENETICS, Issue 2003P. Beeckmann Summary Linkage maps of Sus scrofa chromosome 1 (SSC1) have been produced using 10 markers in three different F2 families based on crosses of Meishan (M), Pietrain (P) and Wild Boar (W). The maps were similar for the different families and show higher paternal recombination, especially in the interval SW2130,SW803. Quantitative trait loci (QTLs) affecting body conformation, carcass composition, fat deposition and numbers of teats were identified in all three families. Major QTLs were mapped in chromosomal intervals centred at approximately 60, 120 and 170 cM. The QTLs explain up to 8.4% of phenotypic variance in the F2 generation. Pietrain QTL alleles were superior in comparison with Wild Boar and Meishan alleles for most of the trait values. Meishan alleles were associated with highest fat deposition. Additive gene effects were generally larger than dominance effects. QTL profiles on SSC1 differed between families, with the W × P family being most distinct. Zusammenfassung Kopplungskarten für Chromosom 1 (SSC1), die durch die Analyse von 10 Markern erstellt wurden, stimmten in drei untersuchten F2 -Familien (basierend auf Kreuzungen mit Meishan (M), Pietrain (P) und Wildschwein (W)) wie auch mit den bisher publizierten Karten überein. Die geschlechtsspezifischen Karten zeigten eine höhere Frequenz der Rekombinationen in der paternalen Meiose als in der maternalen, besonders im Intervall SW2130 bis SW803. Auf SSC1 konnten bedeutsame QTL-Effekte mit Wirkung auf Wachstum, Schlachtkörperzusammensetzung und Fettansatz sowie die Zitzenzahl in allen drei Familien kartiert werden, insbesondere in den Regionen um 60, 120 und 170 cM. Sie erklärten bis zu 8,4% der phänotypischen Varianz in der F2 -Generation. Pietrain-Allele zeigten positive Auswirkungen auf die meisten Fleischleistungsmerkmale. Meishan-Allele waren mit einer stärkeren Verfettung assoziiert. Es wurden Unterschiede zwischen den QTL-Profilen in den Familien beobachtet, wobei die Familie W × P besonders stark von den QTL-Profilen in den beiden anderen Familien abwich. [source] Linkage and QTL mapping for Sus scrofa chromosome 11JOURNAL OF ANIMAL BREEDING AND GENETICS, Issue 2003M. Dragos-Wendrich Summary Linkage and QTL maps of Sus scrofa chromosome 11 (SSC11) have been produced based on four microsatellite markers genotyped in three F2 families from Wild Boar (W), Meishan (M) and Pietrain (P) crosses. The maps were similar across the families and in agreement with already published maps. Quantitative Trait Loci (QTLs) were identified in the W × M family and not in the M × P and W × P families. The QTLs affected live weight, loin and neck meat weight, back-fat depth and food consumption, and explained up to 4.7% of the F2 phenotypic variance. Additive and dominance effects were similar in size. The Wild Boar QTL alleles led to higher trait values in comparison with Meishan alleles. Zusammenfassung Kopplungskarten für Chromosom 11 (SSC11), die durch Analyse von vier Mikrosatelliten-Markern in drei F2 -Familien aus Kreuzungen von Wildschwein (W), Meishan (M) und Pietrain (P) erstellt wurden, zeigten eine gute Übereinstimmung zwischen den Familien sowie mit Literaturergebnissen. Quantitative Trait Loci (QTLs) waren in der Familie W × M nachzuweisen, jedoch nicht in den Familien M × P und W × P. Sie beeinflussten Lebendgewicht, Kotelettstranggewicht, Rückenspeckdicke und Futteraufnahme und erklärten bis zu 4,7% der phänotypischen Varianz in der F2 -Generation. Additiv- und Dominanzeffekte waren ähnlich groß. Wildschwein-QTL-Allele führten im Vergleich zu Meishan-Allelen zu höheren Merkmalswerten. [source] Genetic Analysis of the Latent Period of Stripe Rust in Wheat SeedlingsJOURNAL OF PHYTOPATHOLOGY, Issue 6 2004H. Dehghani Abstract Genetics of slow-rusting resistance to yellow rust (Puccinia striiformis f.sp. tritici) was studied by a half-diallel design using six wheat varieties, Tiritea (susceptible), Tancred, Kotare, Otane, Karamu, and Briscard. The parents and 15 F1 progenies were evaluated in the greenhouse by three pathotypes 7E18A,, 38E0A+, and 134E134A+. The latent period was measured as the number of days from inoculation to the appearance of the first pustule. For each pathotype a randomized complete block design was used and data were analysed by methods of Griffing and Hayman. The range of average degree of dominance was from complete dominance to over-dominance. Positive and negative degrees of dominance were observed for each pathotype that showed the reversal of dominance. Analysis of variance showed the importance of both additive and dominance effects in controlling the latent period. Broad-sense heritabilities were 0.99 and narrow-sense heritabilities ranged from 0.85 to 0.94. Briscard and Karamu for the pathotypes 38E0A+ and 134E134A+, Kotare for the pathotype 7E18A, and Tancred for the pathotype 38E0A+ had significant and positive general combining ability (GCA) (more resistance) for latent period. The crosses of Kotare with Tancred, Briscard and Karamu indicated the highest and positive specific combining ability (SCA) for the pathotype 7E18A,. Significant additive genetic component and moderate narrow-sense heritability indicate the possibility of improving for longer latent period of stripe rust in breeding programmes. [source] Is the productivity of vegetation plots higher or lower when there are more species?OIKOS, Issue 2 2003Variable predictions from interaction of the, competitive dominance effect' on the habitat templet, sampling effect' Using a habitat templet model, we predict that the productivity (total biomass) of plots within a plant community may be positively, negatively or not at all related to variation in the number of species per plot, depending on successional stage (time since major disturbance) and habitat carrying capacity (reflecting the total resource supplying power of the habitat). For plots of a given size, a positive relationship between productivity and species richness is predicted in recently disturbed habitats because local neighbourhoods here will have been assembled largely stochastically, usually from a pool of available species with a right-skewed size frequency distribution. Hence, in the earliest stages of succession, plots will have relatively high total biomass only if they contain at least some of the relatively uncommon larger species which will, in turn, be more likely in those neighbourhoods that contain more species (the sampling effect). Among these will also be some of the more common smaller species; hence, these high biomass, species-rich plots should have relatively low species evenness, in contrast to what is predicted under effects involving species complementarity. In late succession, the plots with high total biomass will still be those that contain relatively large species but these plots will now contain relatively few species owing to increased competitive exclusion over time (the competitive dominance effect). In intermediate stages of succession, no relationship between plot productivity and species richness is predicted because the opposing sampling and competitive dominance effects cancel each other out. We predict that the intensity of both the sampling and competitive dominance effects on the productivity/species richness relationship will decrease with decreasing habitat carrying capacity (e.g. decreasing substrate fertility) owing to the inherently lower variance in between-plot productivity that is predicted for more resource-impoverished habitats. [source] Inheritance of reduced linolenic acid content in the Ethiopian mustard mutant N2-4961PLANT BREEDING, Issue 3 2002L. Velasco Abstract The zero erucic acid Ethiopian mustard lines developed so far are characterized by an exceptionally high linolenic acid content in the seed oil. The mutant line N2-4961, expressing low linolenic acid content in a high erucic acid background, was developed through chemical mutagenesis. The objective of this research was to study the inheritance of low linolenic acid content in this mutant. Line N2-4961 was reciprocally crossed with its parent line C-101 and the linolenic acid content of the reciprocal F1, F2 and BC1 generations was studied. No maternal, cytoplasmic or dominance effects were detected in the analysis of F1 seeds and F1 plants from reciprocal crosses. Linolenic acid content segregated in 1: 2: 1 ratios in all the F2 populations studied, suggesting monogenic inheritance. This was confirmed with the analysis of the reciprocal backcross generation. The simple inheritance of low linolenic acid content in N2-4961 will facilitate the transference of this trait to zero erucic acid lines of Ethiopian mustard. [source] Genetic effects of the soft starch (h) and background loci on volume of starch granules in five inbreds of maizePLANT BREEDING, Issue 2 2000J. A. Wilson Abstract Larger particle volume is beneficial for many aspects of maize starch processing, and may improve the performance of some starch attributes. This study focused on the soft starch (h) locus to identify its potentially influential role in starch particle volume distribution. The objectives were to study the genetic expression of starch particle volume of the h locus in different genetic backgrounds and the gene action conditioning starch particle volume of other loci in both normal-starch and h -starch backgrounds. Forty-five populations (five intra-inbred F1s, 10 hybrid F1s 10 F2s, 10 BC1F1s to h/h parent, and 10 BC1 to h:h conversion of normal parent) were planted in 1993 at two locations and in 1995 at one location. Selfed heterozygotes (±/h) in all generations provided intra-ear comparisons of normal and h starch, and F3 and BC1F2 generations provided inter-ear comparisons. Significant differences were found between normal and h:h genotypes in all intra-ear and inter-ear comparisons. In all cases, general combining ability effects were highly significant, suggesting the presence of additive gene effects. Generation mean analysis of normal and h:h starch materials yielded similar results, indicating the predominance of additive and some dominance effects for other loci on starch particle volume. These results indicate the usefulness of the soft starch gene and additional genetic variation among inbreds in the improvement of starch particle volume for increased starch recovery in wet milling. [source] Evaluation of SPATA1 -associated markers for stallion fertilityANIMAL GENETICS, Issue 4 2009K. Giesecke Summary Stallion fertility is an economically important trait because the use of artificial insemination is increasing in the horse industry and superior sires are used more intensely. Molecular genetic markers may be useful as early indicators for a stallion's fertility and genetic improvement programmes. The testis-specific SPATA1 protein is involved in shaping the sperm head during spermatogenesis. Thus, the spermatogenesis associated 1 (SPATA1) gene was chosen as candidate for stallion fertility, and we analysed intragenic single nucleotide polymorphisms (SNPs) as genetic markers for the least square means (LSM) of the pregnancy rate per oestrus of stallions and breeding values (BV) for the paternal and embryonic component of the pregnancy rate per oestrus. We sequenced the cDNA of SPATA1 to verify the annotated mRNA sequence. One SPATA1 -associated intronic SNP (BIEC2-968854) showed a significant association with the embryonic component of BVs of stallions for the pregnancy rate per oestrus. The embryonic component of BVs was positively associated with homozygous C/C stallions. Both the additive and dominance effects were significant with values of ,5.8% (P = 0.01) and ,6.4% (P = 0.02) for the embryonic component of BVs. For the same SNP, a suggestive association was found for the LSM of the pregnancy rate per oestrus of stallions. Heterozygous stallions had higher pregnancy rates per oestrus than homozygous stallions. The dominance effect was 4.1% with a nominal P -value of 0.02. The SNP BIEC2-968854 can change an SP1 binding site and thus we assume that gene regulation may be influenced through this intronic mutation. This is the first report on SPATA1 being associated with the pregnancy rate per oestrus for stallions. [source] A genome scan for quantitative trait loci affecting three ear traits in a White Duroc × Chinese Erhualian resource populationANIMAL GENETICS, Issue 4 2009J. Ma Summary Chinese Erhualian pigs have larger and floppier ears compared with White Duroc pigs (small, half- or fully-pricked ears). To identify quantitative trait loci (QTL) for ear weight and area as well as erectness, a genome-wide scan with 194 microsatellites was performed in a White Duroc × Chinese Erhualian resource population (>1000 F2 animals). Twenty-three genome-wide significant QTL and 12 suggestive QTL were identified. All QTL for ear erectness and size detected in two previous studies, bar two on SSC6 and 9, were confirmed here. The 1% genome-wide significant QTL at 70 cM on SSC5 and at 58 cM on SSC7 have profound and pleiotropic effects on the three ear traits, with Erhualian alleles increasing weight and area but decreasing erectness. Notably, the 95% confidence interval of the QTL for weight and area on SSC7 spanned only 3 cM. New QTL reaching 1% genome-wide significance were found on SSC8 (at 37 cM) for all three ear traits, on SSC4 and 16 for weight and area, and on SSCX for area. Unexpectedly, Erhualian alleles at these loci were associated with lighter and smaller or erect ear. Some new suggestive QTL were also found on other chromosome regions. Almost all the QTL for weight and area had essentially additive effects, while the QTL for erectness on SSC2, 5 and 7 showed not only additive effects but also partial dominance effects of Erhualian alleles. The two most significant QTL on SSC7 and SSC5 could be promising targets for fine mapping and identification of the causative mutations. [source] Estimation of dominance genetic variances for reproductive traits and growth traits of calves in Japanese Black cattleANIMAL SCIENCE JOURNAL, Issue 4 2004Takafumi ISHIDA ABSTRACT The dominance genetic effects for reproductive and calf growth abilities in the practical Japanese Black populations were examined using average information (AI) algorithm restricted maximum likelihood (REML) under animal models. The reproductive traits were observed in Japanese Black cattle maintained at Tottori and Okinawa prefectures, and growth traits of calves were observed in cattle at Okinawa. The average of dominance relationships in Tottori ranged from 0.2 to 0.4%, while the level in Okinawa was lower and sparse compared with Tottori. The proportions of the dominance variances to sum of additive and dominance variances () were all 0.02 for reproductive traits in Tottori. In contrast, the proportion was 0.02,0.64 in Okinawa regardless of the level of dominance relationships. These proportions suggested that the dominance might affect the expression of calving interval, days open and gestation length in Okinawa, where breeding units were spread over many islands. Although the dominance variances could not estimate birthweight, w as 0.34 for calf market weight and 0.27 for average daily gain from birth to calf market in Okinawa. These values also suggested that the dominance might affect the early growth of calves. In the near future, genetic relationships will become more complicated with continuation of the current selection and mating systems. Therefore, genetic evaluation accounting for dominance effects would be necessary for particular traits and populations. [source] Genetics of resistance to the pink stem borer (Sesamia nonagrioides) in maize (Zea mays)ANNALS OF APPLIED BIOLOGY, Issue 2 2009A. Butrón Abstract Our knowledge of the genetics of resistance to the pink stem borer (Sesamia nonagrioides) in maize (Zea mays) is restricted to a few crosses among maize inbreds. The objectives of this study were to enlarge our understanding of the genetics of traits related to damage by pink stem borer and yield under infestation and to use generation means analyses to compare per se and testcross performance for detecting epistatic effects. All generations, either per se or crossed to testers, were evaluated in a 10 × 10 triple lattice design under artificial infestation with S. nonagrioides in 2005 and 2006. Most traits fit an additive,dominance model; but evidence for epistasis for resistance and yield under infestation was shown. Epistasis, in general, did not appear to play an important role in the inheritance of yield under pink stem borer infestation. However, the epistasis contribution to maize yield performance could be important in some outstanding crosses such as EP42 × A637. Testcross generation means revealed epistatic effects undetected by the generation means analysis, but neither method was able to eliminate dominance effects that could prevail over epistatic effects. [source] Additive, dominance genetic effects for growth-related traits in common carp, Cyprinus carpio L.AQUACULTURE RESEARCH, Issue 14 2006Cheng-Hui Wang Abstract Additive, dominance genetic effects were analysed for body weight (BW) and seven morphometric traits from three variants of red common carp, Cyprinus carpio var. singuonensis, C. carpio var. wuyuanensis and C. carpio var. color, based on a diallel cross-mating design by using the additive,dominance genetic model. The results indicated that at 8 months of age (juvenile stage), the traits of pre-dorsal height (PDH), pre-dorsal width (PDW) and caudal peduncle height (CPH) were mainly controlled by additive effects; the traits of BW, total length (TL), standard length (SL), head length (HL) and caudal peduncle length (CPL) were mainly controlled by dominance effects. The narrow-sense heritabilities of all traits ranged from 0.000 to 0.556; however, the broad-sense heritabilities ranged from 0.453 to 0.775. At 20 months of age (adult stage), the traits of TL, SL, PDH and CPL were mainly controlled by additive effects, whereas the traits of BW, PDW, HL and CPH were mainly controlled by dominance effects. The narrow-sense heritabilities of all traits ranged from 0.000 to 0.710; the broad-sense heritabilities ranged from 0.629 to 0.934. Through the genetic merit prediction from three parents, it was found that the additive and dominance effects of C. carpio var. color could increase the BW and body length in their progeny, but these two genetic effects of C. carpio var. singuonensis and C. carpio var. wuyuanensis could decrease BW in their progeny. The genetic effects of C. carpio var. wuyuanensis could reduce total length, SL and caudal peduncle length, but increase body height in their progeny. [source] Dominance Effects from Local Competitors: Setting Institutional Parameters for Employment Relations in Multinational Subsidiaries; a Case from the Spanish Supermarket SectorBRITISH JOURNAL OF INDUSTRIAL RELATIONS, Issue 4 2009Tony Royle Dominance effects are normally associated with multinational corporations (MNCs). However, we argue that a strong local competitor can create ,dominance effects' setting the institutional parameters for employment relations in multinational subsidiaries. Moreover such an effect can be persistent. In this case the Spanish-owned El Corte Inglés (ECI) used its power and influence to establish an employer's federation and two ,yellow unions'. These yellow unions infiltrated the French-owned MNC Carrefour and most of the Spanish supermarket sector by the early 1980s and continue to dominate collective bargaining rounds and works council elections, marginalizing the main independent trade unions. This has resulted in poor pay and working conditions and a lack of effective employee representation across most of the Spanish supermarket sector. The fact that Carrefour established an international framework agreement to observe union rights in 2001 has as yet not changed this situation. [source] | |||||||||||||