Genetic divergence analysis

26.01.2021 By Fauzragore

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. The D 2 analysis allowed the 49 garden cress accessions to be classified into seven distinct clusters. Cluster 1 included 16 accessions that mature and flower early. They also showed higher number of seeds per plant and per plot than the overall mean value.

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Tadele Genetic divergence of selected genotypes in Sunhemp Crotalaria juncea L. Nareshkumar, N. Ganesan, M. Kumar Temesgen Bedassa Gudeta Figures and Tables from this paper. Figures and Tables. Citation Type. Has PDF. Publication Type.

More Filters. View 2 excerpts, cites background. Research Feed. View 3 excerpts, cites background. View 1 excerpt, cites background. Highly Influenced. View 1 excerpt, cites results. Genetic variation in garden cress Lepidium sativum L. Genetic diversity of seed storage protein in the Ethiopian garden cress Lepidium sativum L. Correlation and path coefficient analysis of yield and quality components of garden cress Lepidium sativum L.Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.

genetic divergence analysis

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genetic divergence analysis

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genetic divergence analysis

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Genetic diversity analysis 1.The geological events, past climatic fluctuations, and river systems played key roles in the spatial distribution, population dynamics, and genetic differentiation of species.

In this work, we selected Pterocarya stenopteraa widespread tree species in China, to test the roles of these factors. Four noncoding spacers, eight microsatellite simple sequence repeat markers, and species distribution modeling were used to examine the phylogeographical pattern of P. Based on chloroplast DNA data, populations of P. The divergence time of these groups fell into the stage of the Qinghai-Tibet Movement, 1.

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For simple sequence repeat data, only one western marginal population YNYB could be separated from other populations, whereas other populations were mixed together.

Our results indicated that the environmental heterogeneity resulting from the Qinghai-Tibet movement might be response for this genetic divergence. The climatic fluctuations in the Pleistocene did not cause the substantial range shift of P. Moreover, we also confirmed the river systems did not act as channels or barrier of dispersal for P. Keywords: Pterocarya stenoptera; cpDNA; microsatellite marker; phylogeography; species distribution modeling. Abstract The geological events, past climatic fluctuations, and river systems played key roles in the spatial distribution, population dynamics, and genetic differentiation of species.Genetic divergence is the process in which two or more populations of an ancestral species accumulate independent genetic changes mutations through time, often after the populations have become reproductively isolated for some period of time.

On a molecular genetics level, genetic divergence is due to changes in a small number of genes in a species, resulting in speciation. Hence, it is more likely that divergence, and subsequently reproductive isolationare the outcomes of multiple small mutations over evolutionary time accumulating in a population isolated from gene flow. Genetic divergence between related populations sometimes start by genetic bottleneckand founder effects.

One possible cause of genetic divergence is the founder effectwhich is when a few individuals become isolated from their original population. Those individuals might overrepresent a certain genetic pattern, which means that certain biological characteristics are overrepresented. These individuals can form a new population with different gene pools from the original population.

By chance, 10 individuals are separated from the original population.

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As a result, the percentage of the population with blue eyes would be higher than the population with brown eyes, which is different from the original population. Another possible cause of genetic divergence is the bottleneck effect.

The bottleneck effect is when an event, such as a natural disaster, causes a large portion of the population to die. By chance, certain genetic patterns will be overrepresented in the remaining population, which similar to what happens with the founder effect.

From Wikipedia, the free encyclopedia. Causes of Genetic Divergence [ edit ] One possible cause of genetic divergence is the founder effectwhich is when a few individuals become isolated from their original population.

Understanding Evolution. Annual Review of Ecology and Systematics. Systematics and the Origin of Species. New York: Columbia University Press. Reece, Jane B. CS1 maint: others link. Evolutionary biology. Introduction Outline Timeline of evolution Evolutionary history of life Index. Canalisation Evolutionary developmental biology Genetic assimilation Inversion Modularity Phenotypic plasticity.

Cell DNA Flagella Eukaryotes symbiogenesis chromosome endomembrane system mitochondria nucleus plastids In animals eye hair auditory ossicle nervous system brain. Category Commons Portal WikiProject.

genetic divergence analysis

Categories : Evolutionary biology Population genetics Genetics stubs. Hidden categories: CS1 maint: others All stub articles. Namespaces Article Talk. Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file.Metrics details. Geographical isolation combined with historical climatic fluctuations have been identified as two major factors that contribute to the formation of new species. On the other hand, biotic factors such as competition and predation are also able to drive the evolution and diversification of organisms.

To determine whether geographical barriers contributed to population divergence or speciation in the rare endemic cicada Subpsaltria yangi the population differentiation, genetic structure and phylogeography of the species were investigated in the Loess Plateau and adjacent areas of northwestern China by analysing mitochondrial and nuclear DNA and comparing the calling song structure of male individuals.

The results reveal a low level of genetic differentiation and relatively simple phylogeographic structure for this species, but two independent clades corresponding to geographically isolated populations were recognised. Genetic and geographical distances were significantly correlated among lineages.

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Results of divergence-time estimation are consistent with a scenario of isolation due to glacial refugia and interglacial climate oscillation in northwestern China. This population is also significantly different in calling song structure from other populations. Geographical barriers i. This provides a possible example of incipient speciation in Cicadidae, improves understanding of population differentiation, acoustic signal diversification and phylogeographic relationships of this rare cicada species of conservation concern, and informs future studies on population differentiation, speciation and phylogeography of other insects with a high degree of endemism in the Helan Mountains and adjacent areas.

Geographic isolation is essential to most speciation events, because biogeographic barriers due to distance, water bodies, mountains, deserts, etc. The mosaic of high mountains in East Asia forms a complex terrain imposing geographical barriers hindering movement of many animal species [ 14 ].

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The uplift of the Qinghai-Tibet Plateau about 1. Previous studies of East Asian insects confirmed that the complex local topography and geographic isolation had a marked effect on the distribution and demography of many insects, e. During the past three million years, global climate has fluctuated greatly, which resulted in the recent major ice age [ 11 ], and substantial changes in the distributions of many living organisms, expressed differently in temperate and tropical zones [ 1213 ].

Such changes include fragmentation of previously contiguous populations which, in animals, may result in both genetic and behavioral divergence. In particular, acoustic signals function in species recognition and mate choice in a wide range of taxa. It has been proposed that divergence in acoustic signals often plays an important part in speciation, and study of such signals has been used to discover examples of incipient or cryptic speciation [ 1617 ].

The increasing desertification of northern China caused by the uplift of the QTP effectively changed the biodiversity of this area [ 1819 ]. These mountains are considered an important area for biodiversity conservation in China because they provide suitable habitats and environmental conditions for many highly endemic species [ 2223 ].

The mountains are surrounded by deserts and semi - deserts which may serve as geographical barriers to species with limited dispersal ability [ 24 ], and the isolated peaks may be equivalent to islands biogeographically [ 2526 ].

The patchwork of mountains, deserts and semi - deserts in this region may promote the differentiation of populations and increase the likelihood of speciation.

The large body size and low dispersal ability of cicadas has led to their being used as model organisms for phylogeographic and speciation studies in different regions of the world including New Zealand [ 2728 ], South Africa [ 29 ], North America [ 30 ] and the Mediterranean area [ 31 ].

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The cicada Subpsaltria yangi Chen is the only known species of the tribe Tibicininii in China.Toggle navigation. Login Categories Journals. Publications Publications Authors. Translate page:. Allergy and Immunology Cardiology Clinical Procedures Critical Care Dermatology Emergency Medicine Endocrinology Gastroenterology Genomic Medicine Hematology Infectious Diseases Nephrology Neurology Obstetrics and Gynecology Oncology Pathology Perioperative Care Physical Medicine and Rehabilitation Psychiatry Pulmonology Radiology Rheumatology Sports Medicine Genome wide analysis reveals genetic divergence between Goldsinny wrasse populations.

BMC Genet Oct 9;21 1 Epub Oct 9.

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Institute of Marine Research, P. BoxNordnes,Bergen, Norway. Background : Marine fish populations are often characterized by high levels of gene flow and correspondingly low genetic divergence.Biotech Articles.

Publish Your Research Online. Article Summary: D2 Statistic is potential tool for identification of parents which are genetically diversified and used in hybridization programme. D 2 Statistic Techniques used for Analysis of Genetic Divergence Author: Shaukeen Khan D 2 statistics analysis is used for selection of genetically divergent parents in hybridization programme. The concept of D 2 statistics was originally developed by P. Mahalanobis in Rao used this technique for assessment of genetic diversity in plant breeding.

It is used to measure the degree of diversification and determines relative portion of each component trait to total divergence. A large number of germplasm lines can be evaluated at a time for genetic diversity by it. It provides reliable estimates of genetic divergence.

In plant breeding, genetic diversity plays a key role because hybrids between lines of diverse origin display a greater heterosis than closely related parents. This technique has been observed in fescue, maize, alfalfa, cotton and several other crops. Genetic diversity arises due to geographical separation. It is based on second order statistics, so analysis is more difficult than metroglyph analysis.

Here, Analysis is possible from replicated data and genetic diversity is depicted by cluster diagram. The estimation of D2 values is very complicated specially when number of trait being studied becomes large because it needs inversion of matrix of higher order. The computation is very much simplified when traits under study are indepdent.

There are three methods of grouping the genotypes into distinct clusters like Tenative grouping, Tocher method and Canonical root methods. It consists three major steps : Selection of genotypes, Eualuation of material, Biometricl analysis.

According to this technique, if distance between cluster or groups of genotypes is morethree will be more genetically divergent parents of these groups. Sothese cluster will be used in hybridization programme because of high genetic diversity leads to higher heterosis. It is numerical approach which is used for measuring genetic divergence in germplasm collections.

It is based on second order statistics. Analysis is more difficult than metroglyph analysis.

Genetic divergence

Analysis is possible from replicated data. It helps in selection of genetically divergent parents for their exploitation in hybridization programme.

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It measure the degree of diversification and determines relative portion of each component trait to total divergence. It provides reliable estimates of genetic divergence 4. Analysis is difficult. The estimates are not satisfactory. The analysis is not possible from unreplicated data. References: 1. Daniel, R. Future challenges in food production in India. Mahalanobis, P. On the generalized distance in statistic. Collection Agency Cost Collection agency for small business.

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