NOR sites detected by Ag-dAPI staining of an unusual autosome chromosome of Bradysia hygida (Diptera:Sciaridae) colocalize with C-banded heterochromatic region.

abstract：:Despite remarkable advances in genomic studies over the past few decades, surprisingly little is known about the processes governing genome evolution at macroevolutionary timescales. In a seminal paper, Hinegardner and Rosen (Am Nat 106:621-644, 1972) suggested that taxa characterized by larger genomes should also dis...

journal_title：Genetica

authors： Pie MR,Torres RA,Brito DM

更新日期：2007-09-01 00:00:00

abstract：:Genome reduction has been considered the hallmark of endosymbiotic bacteria, such as endocellular mutualists or obligatory pathogens until it was found exactly the same in several free-living bacteria. In endosymbiotic bacteria genome reduction is mainly attributed to degenerative processes due to small population siz...

journal_title：Genetica

authors： Marais GA,Calteau A,Tenaillon O

更新日期：2008-10-01 00:00:00

abstract：:This study centers on marker chromosomes carrying expanded chromosomal regions which were observed in two independent derivatives of the AA12 murine fibrosarcoma line, the 10(-3) M MTX-res H2 and the 5 x 10(-7) M MTX-res E. Previous characterization of the marker chromosomes of MTX-res variants showed their common der...

journal_title：Genetica

authors： Riva P,Orlando S,Labella T,Larizza L

更新日期：1994-01-01 00:00:00

abstract：:The underlying relationship between functional variables and sequence evolutionary rates is often assessed by partial correlation analysis. However, this strategy is impeded by the difficulty of conducting meaningful statistical analysis using noisy biological data. A recent study suggested that the partial correlatio...

journal_title：Genetica

authors： Kim SH,Yi SV

更新日期：2007-10-01 00:00:00

abstract：:The length of the Thr-Gly repeat within the period gene of Drosophilids, coevolves with its immediate flanking region to maintain the temperature compensation of the fly circadian clock. In Drosophila simulans, balancing selection appears to maintain a polymorphism in this region, with three repeat lengths carrying 23...

journal_title：Genetica

authors： Rogers AS,Escher SA,Pasetto C,Rosato E,Costa R,Kyriacou CP

更新日期：2004-03-01 00:00:00

abstract：:Wild-caught flies of Drosophila melanogaster from seven natural populations of extreme regions of Brazil (São Luís, MA; Teresina, PI; Rio Cipó, MG; Maringá, PR; São José do Rio Preto, SP; Joinville, SC; and Porto Alegre, RS) were studied with the purpose of evaluating hybrid dysgenesis due to mobilization of P element...

journal_title：Genetica

authors： Vetorazzi VC,Lourenço MF,Carareto CM

更新日期：1999-01-01 00:00:00

abstract：:This paper discusses a novel theory of senescence: the community of pathogens within each host individual evolves during the life-time of the host, and in doing so progressively reduces host vigour. I marshal evidence that asymptomatic host individuals maintain persistent populations of viral pathogens; that these pat...

journal_title：Genetica

authors： Bell G

更新日期：1993-01-01 00:00:00

abstract：:Many traits are defined as ratios of two quantitative traits. Methods of QTL mapping for regular quantitative traits are not optimal when applied to ratios due to lack of normality for traits defined as ratios. We develop a new method of QTL mapping for traits defined as ratios. The new method uses a special linear co...

journal_title：Genetica

authors： Yang R,Li J,Xu S

更新日期：2008-03-01 00:00:00

abstract：:Most part of the eukaryotic genome is composed of repeated sequences or multiple copies of DNA, which were considered as "junk DNA", and may be associated to the heterochromatin. In this study, three populations of Astyanax aff. scabripinnis from Brazilian rivers of Guaratinguetá and Pindamonhangaba (São Paulo) and a ...

journal_title：Genetica

authors： Barbosa P,de Oliveira LA,Pucci MB,Santos MH,Moreira-Filho O,Vicari MR,Nogaroto V,de Almeida MC,Artoni RF

更新日期：2015-02-01 00:00:00

abstract：:An analysis of Arabidopsis thaliana heterochromatic regions revealed that genomic sequences immediately flanking the major 180 bp satellite are essentially made of middle repetitive sequences and that most of these sequences correspond to defective Athila retroelements. Using YAC and lambda clones, we evaluated the di...

journal_title：Genetica

authors： Pélissier T,Tutois S,Tourmente S,Deragon JM,Picard G

更新日期：1996-03-01 00:00:00

abstract：:Southern analysis of within-gel digested and restricted human cells has revealed very large Satellite III restriction fragments which show clear inter-individual length polymorphism. The Mb and sub-Mb length of these fragments indicate that they arise from regions of heterochromatin which contain homogeneous Satellite...

journal_title：Genetica

authors： Fowler JC,Burgoyne LA

更新日期：1992-01-01 00:00:00

abstract：:A study has been made on the genetic basis of meiotic drive at the Distorter (D) locus which, in coupling with the male-determining gene (or region) M on the Y chromosome, causes production of excess male progeny. Its effect is regulated by the sensitivity/resistance of the X chromosome. This study demonstrates that t...

journal_title：Genetica

authors： Wood RJ,Ouda NA

更新日期：1987-05-15 00:00:00

abstract：:The Anopheles gambiae genome project yielded almost complete sequences for the autosomes and for a large part of the X chromosome, however, no information for the Y chromosome was obtained. Yet, by design, fragmented Y chromosome sequences should be present in the resulting assembly. Here we report the search for Anop...

journal_title：Genetica

authors： Krzywinski J,Chrystal MA,Besansky NJ

更新日期：2006-03-01 00:00:00

abstract：:Age-specific mortality rates decelerate at older ages in laboratory populations in the Medfly Ceratitis capitata. This has been interpreted by Carey et al. (1992) to reflect a slowing of the aging process, but might also be explained by declining adult density. Here it is argued that the density explanation, as presen...

journal_title：Genetica

authors： Curtsinger JW

更新日期：1995-01-01 00:00:00

abstract：:Members of the EPIDERMAL PATTERNING FACTOR-LIKE (EPFL) family play diverse roles in plant growth and development, including the guidance of inflorescence architecture and pedicel length. In this work, we identified and characterized the EFPL gene TaEPFL1 from the wheat pistillody mutant HTS-1. Sequence alignment and p...

journal_title：Genetica

authors： Sun Q,Qu J,Yu Y,Yang Z,Wei S,Wu Y,Yang J,Peng Z

更新日期：2019-04-01 00:00:00

abstract：:Doublesex (dsx) is a double-switch gene at the bottom of the somatic sex-determination hierarchy which regulates sexual dimorphism in many insects. Here, Drosophila melanogaster homologues of dsx were isolated in two Bactrocera species, the oriental fruit fly, B. dorsalis, and the guava fruit fly, B. correcta. Results...

journal_title：Genetica

authors： Permpoon R,Aketarawong N,Thanaphum S

更新日期：2011-01-01 00:00:00

abstract：:Shortly after the death, in 1971, of Cyril Burt, a prominent British psychologist, the authenticity of his accounts of intelligence test results from the largest report sample of MZA's (monozygotic twins reared apart) was challenged. Charges of fraud by Burt's critics and countercharges by his supporters started an ac...

journal_title：Genetica

authors： Samelson F

更新日期：1997-01-01 00:00:00

abstract：:Epidemiologically, the Acquired Immune Deficiency Syndrome, AIDS, is transmitted and distributed in the USA and Europe almost entirely in well-defined subsets of populations engaging in, or subjected to, the effects of behaviours which carry high risks of genital and systemic infections. The persons predominantly affe...

journal_title：Genetica

authors： Stewart GT

更新日期：1995-01-01 00:00:00

abstract：:Signatures of balancing selection are often found when investigating the extremely polymorphic regions of major histocompatibility complex (MHC) genes, and it is generally accepted that selective forces maintain this polymorphism. However, the exact nature of the selection is controversial. Theoretical studies have ma...

journal_title：Genetica

authors： Ekblom R,Saether SA,Fiske P,Kålås JA,Höglund J

更新日期：2010-04-01 00:00:00

abstract：:Heterochromatin plays an important role in the spatial arrangement and evolution of the eukaryotic genetic apparatus. The closely related species Drosophila virilis (phyla virilis) and D. kanekoi (phyla montana) differ in the amount of heterochromatin along the chromosomes as well as by the presence of the metacentric...

journal_title：Genetica

authors： Wasserlauf I,Usov K,Artemov G,Anan'ina T,Stegniy V

更新日期：2015-06-01 00:00:00

abstract：:The chromosome morphology and meiotic pairing behavior in the pollen mother cells (PMCs) of Metasequoia glyptostroboides were investigated. The results showed that: (1) The chromosome number of the PMCs was 2n = 22. (2) The PMCs developed in the successive manner, and the nucleoids in the dynamic development were simi...

journal_title：Genetica

authors： He Z,Li J,Cai Q,Li X,Huang H

更新日期：2004-11-01 00:00:00

abstract：:Satellite DNA (satDNA) is a non-coding component of eukaryotic genomes, located mainly in heterochromatic regions. Relevance of satDNA began to emerge with accumulating evidence of its potential yet hardly comprehensible role that it can play in the genome of many organisms. We isolated the first satDNA of the codling...

journal_title：Genetica

authors： Věchtová P,Dalíková M,Sýkorová M,Žurovcová M,Füssy Z,Zrzavá M

更新日期：2016-08-01 00:00:00

abstract：:Insect resistance in soybean has been an objective in numerous breeding programs, but efforts to develop high yielding cultivars with insect resistance have been unsuccessful. Three Japanese plant introductions, PIs 171451, 227687 and 229358, have been the primary sources of insect resistance alleles, but a combinatio...

journal_title：Genetica

authors： Boerma HR,Walker DR

更新日期：2005-02-01 00:00:00

abstract：:Homeodomain-leucine zipper (HD-Zip) transcription factors regulate developmental processes and stress responses in plants, and they vary widely in gene number and family structure. In this study, 55 predicted maize HD-Zip genes were systematically analyzed with respect to their phylogenetic relationships, molecular ev...

journal_title：Genetica

authors： Mao H,Yu L,Li Z,Liu H,Han R

更新日期：2016-04-01 00:00:00

abstract：:Chromosomal polymorphism was assessed in the southern short-tailed shrew (Blarina carolinensis) using standard metaphase chromosome and G-banding techniques. Twenty-one animals (11 males, 10 females) from the Meeman Biological Station in Shelby Co., Tennessee, were examined for diploid number. Results showed diploid n...

journal_title：Genetica

authors： Elrod DA,Beck ML,Kennedy ML

更新日期：1996-10-01 00:00:00

abstract：:The Bovidae X-chromosome shows a considerable variation, in contrast to the preservative autosomal conservatism. The X-chromosome variation is mostly a consequence of the constitutive heterochromatin (CH) variation; in what respect to its amount and position. This is especially common among the non-Bovinae subfamilies...

journal_title：Genetica

authors： Chaves R,Santos S,Guedes-Pinto H

更新日期：2004-07-01 00:00:00

abstract：:The androgen receptor (AR) gene, located on the X chromosome, is an important regulator of human spermatogenesis. In the past decade, the link between the CAG polyglutamine tract, situated on exon one of the AR gene, and reduced spermatogenesis has become a controversial one. Alterations in the length of the CAG polyg...

journal_title：Genetica

authors： Lavery R,Houghton JA,Nolan A,Glennon M,Egan D,Maher M

更新日期：2005-03-01 00:00:00

abstract：:The zygotic expression of only a few Drosophila genes is known to be required for completion of the normal embryonic mitoses. Molecular genetic analyses of these genes reveal that they fall into two classes, those whose mRNA levels are regulated in a stage and/or tissue-specific fashion to control cell cycle events du...

journal_title：Genetica

authors： Saint R,Patterson B

更新日期：1993-01-01 00:00:00

abstract：:The common yellow butterfly Eurema hecabe is widely distributed in East Asia, and is one of the most burdensome species for taxonomists due to the numerous geographic and seasonal wing colour patterns. Moreover, within this species, individuals with a yellow wing fringe that occur in temperate regions of Japan (Y type...

journal_title：Genetica

authors： Narita S,Nomura M,Kato Y,Yata O,Kageyama D

更新日期：2007-11-01 00:00:00

abstract：:The distribution and expression of nucleolus organizer regions (NORs) were analyzed in seven species of marsupials representative of the three karyotypes (2n = 14, 18 and 22) found in the American family Didelphidae. Analyses comprised silver-staining of NORs and fluorescence in situ hybridization with an rDNA probe. ...

journal_title：Genetica

authors： Svartman M,Vianna-Morgante AM

更新日期：2003-05-01 00:00:00