genetic variation in natural populations

white - forest genetics (cabi, 2007)

Ngày tải lên : 03/04/2014, 12:12

... Selection Predicting Genetic Gain from Mass Selection Equations for Predicting Genetic Gain Selection Intensity Factors Affecting Genetic Gain from Mass Selection Indirect Mass Selection Definition and ... Functions of Genetic Tests Defining Genetic Architecture Progeny Testing Establishing Advanced-generation Base Populations Quantifying Realized Gains Mating Designs Incomplete-pedigree Mating Designs ... Genetic Composition of Populations Genotype and Allele Frequencies Hardy-Weinberg Principle Mating Systems and Inbreeding Influence of Inbreeding on Genotypic Frequencies Inbreeding Coefficient and...

702
696
0

Báo cáo khoa học: "Intra- and interpopulational genetic variation in juvenile populations of Quercus robur L and Quercus petraea Lieb" pot

Ngày tải lên : 08/08/2014, 19:21

... succeeding life stages The genetic multiplicity was very large in all samples investigated including single-population samples This finding concurs with results of a recent study in 32 European populations ... Particularly in oak species, it appears that large genetic variation should be incorporated in productive populations in order to maintain the potential of these populations to adapt to and to survive in ... / Samples in the description of the genetic variation in oak populations and thus in the characterization of the natural variability of forest ecosystems Data on patterns of genetic variation...

12
261
0

báo cáo khoa học: "The analysis of quantitative variation in natural populations with isofemale strains" pptx

Ngày tải lên : 09/08/2014, 22:22

... examples are graphed in figure « = = C Isofemale strains maintained at a finite population size increase divergence among isofemale strains if they are maintained sizes or kept in the laboratory ... among strains expanded to an infinite size To examine the distribution of genetic variance within and between isofemale we first consider the case where strains are expanded to an infinite size ... I Introduction Isofemale strains have an important role in the assessment of the nature and range phenotypic variation in natural populations While these strains were initially used...

12
286
0

báo cáo khoa học: "Allozyme variation in natural populations of Lymantria dispar (Lepidoptera)" docx

Ngày tải lên : 09/08/2014, 22:23

... frequency in all populations but those of o8 Morocco ; Lap-2 is rare in all populations except China ; Lap-3 is common in 1o3 100 France and Canada but rare in Morocco and absent in China Finally, ... alleles including a « null » allele The genetic determinism is supported by observing the egg-mass , AYLOR progenies Since in Lymantria dispar multiple matings of females are rare (T 1967) each single ... aspartate aminotransferases (AAT) staining was modified from Mc K et al (1975) After staining, the gels were washed in distilled water, fixed in p 100 acetic acid solution for 48 hours and stored in plastic...

14
211
0

Báo cáo lâm nghiệp: "Variation of morphological traits in natural populations of maritime pine (Pinus pinaster Ait.) in Morocco" pot

Ngày tải lên : 08/08/2014, 00:22

... Sampling and measurements The distribution of maritime pine in Morocco is discontinuous, covering different biogeographic regions, which has resulted in local adaptation We sampled nine natural populations ... morphological variation have also been found in other pine species from Morocco Boulli et al 90 N Wahid et al [11], studying 15 natural populations of Aleppo pine (Pinus halepensis Mill.) representing ... wing traits being more homogeneous throughout the entire Moroccan Aleppo pine range Aleppo pine showed a clinal pattern of variation (latitudinal, altitudinal and longitudinal) in cone, needle...

10
465
0

báo cáo khoa học: " Variation at four enzyme loci in natural populations Drosophila melanogaster : factor analyses of genotypic and gametic associations Angeles ALONSO-MORAGA" pdf

Ngày tải lên : 09/08/2014, 22:22

... components), with the objective of measuring the factors implicit in the physical variables obtained from each individual In our case the individuals are the populations, and the variables are the ... the maintenance of genetic polymorphism in natural populations could be due to an equilibrium between systematic pressures and stochastic pressures, acting on the entire genome of the individuals ... factor increases from figure to figure 5, showing in figure an equal distribution of the gametes in the four axes, because the directional pressures measured in the Aldox locus would be acting on...

10
229
0

Báo cáo sinh học: " Phenotypic and genetic variability of morphometrical traits in natural populations of Drosophila melanogaster and D simulans. I. Geographic variations" docx

Ngày tải lên : 14/08/2014, 19:22

... only by French populations; these populations mainly originated in southern France thus explaining why they are close to Mediterranean populations Latitudinal clines Most of the populations studied ... temperate regions including northern USA, Canada, France and ex-USSR; populations of tropical regions including the West Indies, the Society Islands and Hawaii ; and populations in tropical Africa, ... attractive fermenting fruit traps In all cases, isofemale lines were used, ie wild inseminated females were isolated in culture vials to produce progeny Because wild females may be inseminated by more...

20
355
0

Báo cáo sinh học: " Phenotypic and genetic variability of morphometrical traits in natural populations of Drosophila melanogaster and D simulans. II. Within-population variability" pptx

Ngày tải lên : 14/08/2014, 19:22

... analysis possible A first interesting conclusion is the apparent homogeneity of the intraclass correlations in natural populations The variations observed are mainly due to sampling errors and especially ... suggest that for these traits, genetic variations in natural populations are mainly due to additive effects Wing length in both species shows a completely different picture since t is consistently higher ... than wing length Finally, the ovariole number also has a low heritability (isofemale heritability), especially in D simulans which is genetically less variable than its sibling A final interesting...

14
213
0

Báo cáo sinh học: "Estimation of relatedness in natural populations using highly polymorphic genetic" docx

Ngày tải lên : 14/08/2014, 20:20

... York Kuhnlein U, Zadworny D, Dawe Y, Fairfull RW, Gavora JS (1990) Assessment of inbreeding by DNA fingerprinting: development of a calibration curve using defined strains of chickens Genetics ... explain such results: selection against heterozygotes, inbreeding, and/or the mixing of populations with different allelic frequencies (Wahlund effect) However, it remains difficult to determine ... sequences, such as minisatellites (Jeffreys et al, 1985) Depending on the species being studied, problem lies in finding a highly polymorphic system or a combination of The principal characteristic...

16
231
0

ANALYSIS OF GENETIC VARIATION IN ANIMALS pdf

Ngày tải lên : 28/06/2014, 08:20

... analysis is done by individual genetic profiling (genetic fingerprinting), determining the interrelations between different individuals and evaluating their allele frequency in populations Microsatellite ... Genetic Variation in Animals The inbreeding coefficient of the whole population (FIT = Factor of Inbreeding in the Total population) can be divided into: i) inbreeding coefficient of individuals in ... To obtain phylogenetic trees the following algorithms must be followed: obtaining microsatellites data, comparing the data, selecting optimal phylogenetic methods, constructing and evaluating the...

372
249
0

Báo cáo lâm nghiệp: "Enzymatic polymorphism in natural populations of the sawfly Diprion pini L (Hymenoptera: Diprionidae) L Beaudoin" ppsx

Ngày tải lên : 08/08/2014, 18:21

... about 300 millions FF in the European Community In France D pini is bivoltine in lowland plains, whereas it is univoltine in mountain sites For example, in the Paris Basin, the first generation ... dye-coupler in 0.1M Tris-HCbuffer (pH 7.4) For the visualisation of malate dehydroge(EC11137), gels were incubated at 37 °C in darkness in an appropriate staining solution containing malic acid ... diapause Indeed, a proportion of the individuals of each generation undergo a diapause ranging from a few months up to several years (up to years in high altitude populations) Considering the intensity...

8
186
0

Báo cáo khoa học: "Gene diversity in natural populations of oak species" doc

Ngày tải lên : 08/08/2014, 19:21

... their natural ranges were largely overlapping and 3) natural hybridization was indicated in the literature in all pairwise combinations In defining a complex, we added an additional constraint ... review) Combined inter- and intraspecific assessments of cpDNA polymorphisms in oaks show intriguing features in gene diversity organization Patterns of intraspecific variation are similar in sympatric ... existence of intraspecific variation in cpDNA (Wagner et al, 1987 in Pinus banksiana and Pinus contorta; Neale et al, 1988 in Hordeum; Soltis et al, 1989 in Tolmiea menziesii ; see Harris and Ingram,...

17
265
0

Báo cáo khoa học: " Estimation of Fagus sylvatica L mating system parameters in natural populations" pps

Ngày tải lên : 08/08/2014, 19:21

... distribution according to their flowering period is approximately normal, which induces overlapping classes At last, the beginning and the length of the flowering period vary according to annual climatic ... conditions This can induce interannual variations of phenological gaps and class overlaps These variations may delay the occurrence of a gametic structuration and may induce an inbreeding increase This ... density, outcrossing rate and heterozygote superiority in Ponderosa pine Evolution 38, 1151-1154 Furnier GR, Adams WT (1986) Mating system in natural populations of Jeffrey pine Amer J Bot 73,...

11
275
0

Báo cáo khoa học: "Genetic variation in European larch (Larix decidua Mill)" potx

Ngày tải lên : 08/08/2014, 23:22

... unreliably stained and could not be considered The more cathodal zone exhibits bands differing in mobility and staining intensity In addition, a null allele was observed Thus, this zone was interpreted ... by relatively low genetic variability as well as genetic distances among populations This is surprising considering the extent of the species ranges L laricina expands continent-wide, while L ... found Nei’s (1972) genetic distance indicated relatively large genetic differences among larch populations The isolated position of the Simplon stand in genetic distance matrix and in cluster analysis...

9
281
1

Báo cáo khoa hoc:" Genetic variation in two conserved local Romanian pig breeds using type 1 DNA markers" pdf

Ngày tải lên : 09/08/2014, 18:21

... breed Their manner of breeding following the initial crossing is unknown, but is thought to have been uncontrolled The local breeders used inbreeding to improve and to maintain the superior traits ... leptin and was identiﬁed as a member of the cytokine family of receptors [37] Mutation in leptin receptor gene results in an obese phenotype identical to that of ob mice [20] Genetic variation in ... which is used for preparing special local products Recently, some pig units started to use the Mangalitsa in schemes involving the Duroc, the ﬁnal product being used in preparing a traditional old...

16
282
0

Báo cáo sinh học: "Genetic variability in French populations of the Corsican mouflon (Ovis ammon musimon): analysis of 2 blood proteins and red-cell blood groups" pptx

Ngày tải lên : 09/08/2014, 18:21

... harbor introduced mouflon populations (Nadler et al, 1971; ONC, 1985) In France, introductions took place in the years 1950-1965 and wild-living populations are now present in the mountains of ... 21 polymorphic genetic systems (hemoglobin, transferrin and the 19 remaining blood factors, see table IV) yielding 44 variables Figure shows the projections (’envelopes’ joining points of extreme ... enclosures (see table I) In small founder populations, loss of genetic information is expected due to genetic bottlenecks and subsequent inbreeding Nevertheless, a clear reduction in genetic variability...

13
432
0

Báo cáo sinh học: "On the relevance of three genetic models for the description of genetic variance in small populations undergoing selection" docx

Ngày tải lên : 09/08/2014, 18:22

... an infinite number of independent loci, with identical and small effects It will then be called in the following ’infinitesimal model’ or IM The computation of the inbreeding coefficient in this ... approach intrinsically takes account of the reduction in selection intensity as compared with the theory, of the relationships between mates and inbreeding induced in the offspring and of the changing ... experiments on maize [5] expressed genetic progress over 76 generations, suggesting that genetic variability is infinite according to the infinitesimal theory In animal breeding also, selection experiments...

12
279
0

Population genetic variation in gene expression is associated with phenotypic variation in Saccharomyces cerevisiae pdf

Ngày tải lên : 09/08/2014, 20:20

... between strains at synonymous and amino-acid-altering sites and given that about 70% of coding sites are amino-acid altering Thus, 82% of hybridizations should contain no mismatches The remaining probes ... differences in transcript abundance both within and between closely related species [4-12] In some instances, genetic variation in gene expression has been associated with phenotypic variation ... expression differences in the presence and absence of copper sulfate Expression levels were measured using DNA microarrays in the nine strains during exponential growth in rich medium and in rich medium...

14
305
0

báo cáo khoa học: "Population crash, population flush and genetic variability in cage populations of Drosophila melanogaster" pot

Ngày tải lên : 09/08/2014, 22:23

... significant enough to result in a drastic reconditioning of the gene pool of the new colony resulting in a genetic revolution More or less in the same line of thinking ARSON C (1971) believes ... a These different opinions on the genetic evolution of populations derived from a few founders mainly take into account the genetic variability which is originally present in the founders and ... dominance, and genetic variation Heredity, 48, 63-78 EMPLETON T A.R., 1979 The unit of selection in Drosophila mercatorum II - Genetic revolution and the origin of coadapted genomes in parthenogenetic...

11
212
0

Báo cáo khoa hoc:" Genetic variation in the myeloperoxidase gene and cognitive impairment in Multiple Sclerosis" pot

Ngày tải lên : 11/08/2014, 08:20

... were estimated using logistic regression adjusted for age and sex gene being involved in AD pathology, possibly through oxidation of Aβ or ApoE, promoting their aggregation into insoluble complexes, ... the possible role of MPO polymorphism in the development of cognitive decline in MS This study was mainly designed to investigate whether some clinical and individual variables and the occurrence ... directly through oxidationinduced damage to associated neurons [9], there is biologic evidence implicating MPO in the cognitive decline in patients with MS, but no definite data are currently...

3
247
0