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Diallel Cross
A diallel cross is a mating scheme used by plant and animal breeders, as well as geneticists, to investigate the genetic underpinnings of quantitative traits.Hallauer, A. R. and J. B. Miranda Filho. 1988 Quantitative genetics in maize breeding. 2nd ed. Iowa State University Press, Ames, IO. In a full diallel, all parents are crossed to make hybrids in all possible combinations. Variations include half diallels with and without parents, omitting reciprocal crosses. Full diallels require twice as many crosses and entries in experiments, but allow for testing for maternal and paternal effects. If such "reciprocal" effects are assumed to be negligible, then a half diallel without reciprocals can be effective. Common analysis methods utilize general linear models to identify heterotic groups, estimate general A general officer is an officer of high rank in the armies, and in some nations' air forces, space forces, and marines or naval infantry. In some usages the term "gen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plant Breeding
Plant breeding is the science of changing the traits of plants in order to produce desired characteristics. It has been used to improve the quality of nutrition in products for humans and animals. The goals of plant breeding are to produce crop varieties that boast unique and superior traits for a variety of applications. The most frequently addressed agricultural traits are those related to biotic and abiotic stress tolerance, grain or biomass yield, end-use quality characteristics such as taste or the concentrations of specific biological molecules (proteins, sugars, lipids, vitamins, fibers) and ease of processing (harvesting, milling, baking, malting, blending, etc.). Plant breeding can be performed through many different techniques ranging from simply selecting plants with desirable characteristics for propagation, to methods that make use of knowledge of genetics and chromosomes, to more complex molecular techniques. Genes in a plant are what determine what type of qualit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal Breeding
Animal breeding is a branch of animal science that addresses the evaluation (using best linear unbiased prediction and other methods) of the genetic value (estimated breeding value, EBV) of livestock. Selecting for breeding animals with superior EBV in growth rate, egg, meat, milk, or wool production, or with other desirable traits has revolutionized livestock production throughout the entire world. The scientific theory of animal breeding incorporates population genetics, quantitative genetics, statistics, and recently molecular genetics and is based on the pioneering work of Sewall Wright, Jay Lush, and Charles Roy Henderson, Charles Henderson. Breeding stock Breeding stock is a group of animals used for the purpose of planned breeding. When individuals are looking to breed animals, they look for certain valuable traits in purebred animals, or may intend to use some type of crossbreeding to produce a new type of stock with different, and presumably super abilities in a given area ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quantitative Genetics
Quantitative genetics deals with phenotypes that vary continuously (such as height or mass)—as opposed to discretely identifiable phenotypes and gene-products (such as eye-colour, or the presence of a particular biochemical). Both branches use the frequencies of different alleles of a gene in breeding populations (gamodemes), and combine them with concepts from simple Mendelian inheritance to analyze inheritance patterns across generations and descendant lines. While population genetics can focus on particular genes and their subsequent metabolic products, quantitative genetics focuses more on the outward phenotypes, and makes only summaries of the underlying genetics. Due to the continuous distribution of phenotypic values, quantitative genetics must employ many other statistical methods (such as the ''effect size'', the ''mean'' and the ''variance'') to link phenotypes (attributes) to genotypes. Some phenotypes may be analyzed either as discrete categories or as continuous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wim Crusio
Wim E. Crusio (born Wilhelmus Elisabeth Crusio on 20 December 1954) is a Dutch behavioral neurogeneticist and a '' directeur de recherche'' (research director) with the French National Centre for Scientific Research in Talence, France. Education and career Crusio received his bachelor's degree in biology from Radboud University Nijmegen in 1975, where he went on to obtain a master's degree and then a PhD in 1979 and 1984, respectively. His ''Anubias'' revision, which was originally published in 1979, was translated in German and continues to engender interest. For his PhD thesis, Crusio studied the inheritance of the effects of anosmia on exploratory behavior of mice, and more in general the genetic architecture of exploratory behavior, using quantitative-genetic methods such as the diallel cross. From 1984 to 1987, Crusio worked as a postdoc at the University of Heidelberg, supported by a NATO Science Fellowship and an Alexander von Humboldt Research Fellowship. During 19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sjeng Kerbusch
Sjeng Kerbusch (1947 - 1 March 1991) was a Dutch behavior geneticist. A native of Maastricht, he obtained his Ph.D. from the Catholic University Nijmegen in 1974J.M.L. Kerbusch, 1974. ''Genetic analysis of exploratory behaviour, simple learning behaviour and cerebral AChE and ChE activities in mice by means of the diallel method.'' Ph.D. thesis, Catholic University of Nijmegen, The Netherlands, 63 + 32 pp. as the third Dutchman in this field. Kerbusch' specialism was the application of quantitative-genetic methods, especially diallel crosses and Mendelian crosses, to the analysis of behavior. From 1984 to 1987, he was President of the Dutch Behavior Genetics Contact Group and in 1988 he was local host for the 18th Annual Meeting of the Behavior Genetics Association held in Nijmegen, The Netherlands. Kerbusch died at Nijmegen from complications after a lung transplant Lung transplantation, or pulmonary transplantation, is a surgical procedure in which one or both lungs are re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hans Van Abeelen
Hans van Abeelen (20 November 1936 – 21 August 1998) was the first Dutch behaviour geneticist. He obtained his M.Sc from the University of Groningen and his Ph.D. from the Catholic University of Nijmegen in 1965, where he stayed for the rest of his career as "wetenschappelijk hoofdmedewerker". He was a founding member of the Behavior Genetics Association and was a member-at-large of its executive committee from 1984 till 1987. He also served on the editorial board of its journal, ''Behavior Genetics'', from its creation in 1971 to 1992. Van Abeelen took early retirement in 1991, but nevertheless became one of the founding members of the International Behavioural and Neural Genetics Society The International Behavioural and Neural Genetics Society (IBANGS) is a learned society that was founded in 1996. The goal of IBANGS is "promote and facilitate the growth of research in the field of neural behavioral genetics". Profile Mission Th .... Over the span of his career, he ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Behavior Genetics (journal)
''Behavior Genetics'' is a peer-reviewed scientific journal published monthly by Springer Science+Business Media that is covering "research in the inheritance of behavior". It is the official journal of the Behavior Genetics Association. The journal was established in 1971 with Steven G. Vandenberg as its founding editor-in-chief. The abstracts of the annual meetings are printed in the journal. Each year, the editorial board chooses a particularly meritorious paper in the previous year's volume of the journal for the Fulker Award, acknowledged by "$1000 and a good bottle of wine" as well as a citation made in the journal. This award was created in the honor of David Fulker, a past president of the Behavior Genetics Association (1982) and former editor-in-chief of the journal. Abstracting and indexing The journal is abstracted in '' Biological Abstracts/BIOSIS Previews, CAB Abstracts, Current Awareness in Biological Sciences, Current Contents/Social & Behavioral Sciences'' and '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maternal Effect
A maternal effect is a situation where the phenotype of an organism is determined not only by the environment it experiences and its genotype, but also by the environment and genotype of its mother. In genetics, maternal effects occur when an organism shows the phenotype expected from the genotype of the mother, irrespective of its own genotype, often due to the mother supplying messenger RNA or proteins to the egg. Maternal effects can also be caused by the maternal environment independent of genotype, sometimes controlling the size, sex, or behaviour of the offspring. These adaptive maternal effects lead to phenotypes of offspring that increase their fitness. Further, it introduces the concept of phenotypic plasticity, an important evolutionary concept. It has been proposed that maternal effects are important for the evolution of adaptive responses to environmental heterogeneity. In genetics In genetics, a maternal effect occurs when the phenotype of an organism is determined ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of Genetics
The ''Journal of Genetics'' is a peer-reviewed scientific journal in the field of genetics and evolution. It was established in 1910 by the British geneticists William Bateson and Reginald Punnett and is one of the oldest genetics journals. It was later edited by J.B.S. Haldane, who emigrated to India in 1957, and continued publishing the journal from there. On Haldane's death in 1964, his second wife Helen Spurway continued to publish the journal with Madhav Gadgil, H. Sharat Chandra, and Suresh Jayakar as editors until Spurway died in 1977 and the journal ceased publication. With the permission of Naomi Mitchison, Haldane's sister, it was revived in 1985 and has been published by the Indian Academy of Sciences, currently in collaboration with Springer Science+Business Media, since then. All volumes published between 1910 and 1994 (vol. 1-73) are available free on the website of the Indian Academy of Sciences. According to the ''Journal Citation Reports'', the journal has a 20 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
General Linear Model
The general linear model or general multivariate regression model is a compact way of simultaneously writing several multiple linear regression models. In that sense it is not a separate statistical linear model. The various multiple linear regression models may be compactly written as : \mathbf = \mathbf\mathbf + \mathbf, where Y is a matrix with series of multivariate measurements (each column being a set of measurements on one of the dependent variables), X is a matrix of observations on independent variables that might be a design matrix (each column being a set of observations on one of the independent variables), B is a matrix containing parameters that are usually to be estimated and U is a matrix containing errors (noise). The errors are usually assumed to be uncorrelated across measurements, and follow a multivariate normal distribution. If the errors do not follow a multivariate normal distribution, generalized linear models may be used to relax assumptions about Y and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heterotic Group
Heterosis, hybrid vigor, or outbreeding enhancement is the improved or increased function of any biological quality in a hybrid offspring. An offspring is heterotic if its traits are enhanced as a result of mixing the genetic contributions of its parents. These effects can be due to Mendelian or non-Mendelian inheritance. Definitions In proposing the term heterosis to replace the older term heterozygosis, G.H. Shull aimed to avoid limiting the term to the effects that can be explained by heterozygosity in Mendelian inheritance. Heterosis is often discussed as the opposite of inbreeding depression, although differences in these two concepts can be seen in evolutionary considerations such as the role of genetic variation or the effects of genetic drift in small populations on these concepts. Inbreeding depression occurs when related parents have children with traits that negatively influence their fitness largely due to homozygosity. In such instances, outcrossing shoul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
General Combining Ability
A general officer is an officer of high rank in the armies, and in some nations' air forces, space forces, and marines or naval infantry. In some usages the term "general officer" refers to a rank above colonel."general, adj. and n.". OED Online. March 2021. Oxford University Press. https://www.oed.com/view/Entry/77489?rskey=dCKrg4&result=1 (accessed May 11, 2021) The term ''general'' is used in two ways: as the generic title for all grades of general officer and as a specific rank. It originates in the 16th century, as a shortening of ''captain general'', which rank was taken from Middle French ''capitaine général''. The adjective ''general'' had been affixed to officer designations since the late medieval period to indicate relative superiority or an extended jurisdiction. Today, the title of ''general'' is known in some countries as a four-star rank. However, different countries use different systems of stars or other insignia for senior ranks. It has a NATO rank sc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
