نتایج جستجو برای: population variation
تعداد نتایج: 951806 فیلتر نتایج به سال:
In this paper, we consider the problem of two sided hypothesis testing for the parameter of coefficient of variation of an inverse Gaussian population. An approach used here is the modified signed log-likelihood ratio (MSLR) method which is the modification of traditional signed log-likelihood ratio test. Previous works show that this proposed method has third-order accuracy whereas the traditi...
Copy number variation (CNV) is a major genetic polymorphism contributing to genetic diversity and human evolution. Clinical application of CNVs for diagnostic purposes largely depends on sufficient population CNV data for accurate interpretation. CNVs from general population in currently available databases help classify CNVs of uncertain clinical significance, and benign CNVs. Earlier studies ...
Polymorphisms at di-, tri-, and tetranucleotide microsatellite loci have been analyzed in 14 worldwide populations. A statistical index of population expansion, denoted S(k), is introduced to detect historical changes in population size using the variation at the microsatellites. The index takes the value 0 at equilibrium with constant population size and is positive or negative according to wh...
The purpose of this study is to empirically investigate variation in the migration behaviour across individuals. Both a random parameters logit (RPL) and a standard logit model are employed. The migration models are estimated using a register-based data from Finland. The RPL model proves to be a flexible way to control for random variation in the parameters: the results suggest that many migrat...
Population genetics has evolved from a theory-driven field with little empirical data into a data-driven discipline in which genome-scale data sets test the limits of available models and computational analysis methods. In humans and a few model organisms, analyses of whole-genome sequence polymorphism data are currently under way. And in light of the falling costs of next-generation sequencing...
1 Many plant species are currently restricted to small and isolated populations as a result of habitat destruction and fragmentation. Lack of sufficient data often leads to spatial variation being substituted for temporal variation in models to evaluate management options, but variation in population growth rate ( λ ) between sites or over years may be caused by variation in different life hist...
There is large interspecific variation in the magnitude of population fluctuations, even among closely related species. The factors generating this variation are not well understood, primarily because of the challenges of separating the relative impact of variation in population size from fluctuations in the environment. Here, we show using demographic data from 13 bird populations that magnitu...
White savory(Satureja mutica Fisch & C.A.Mey.) is one of the most widely used medicinal plants in food processing, pharmaceutical and cosmetic industry due to the strongly scented and presence of phenolic compounds such as carvacrol and thymol. This experiment was carried out to evaluate the levels of inter and intra-populations variability of essential oil compositions of S. mutica grown in no...
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