Consulta: subjectFacets:"Hétérozygotie"
Registros recuperados: 3
Data/hora: 08/06/2024 15:40:26

Genetic structure of bisexual and parthenogenetic populations of Artemia from Italian brackish-hypersaline waters
Provedor de dados: 5
Autores: Nascetti, G; Bondanelli, P; Aldinucci, A; Cimmaruta, R.
Eight populations of Artemia displaying different reproduction modalities (amphigonic vs. parthenogenetic) and ploidies (diploid vs. polyploid) have been collected from Italian salt-works or brackish coastal lagoons, and their genetic structure has been investigated using allozyme electrophoresis. The results obtained on genetic differentiation showed that the Tyrrhenian bisexual samples (A. salina) are genetically homogeneous even between populations located in relatively faraway sites (Sardinia-Latium), having a moderate gene flow assisted by migratory waterfowl. The parthenogenetic samples (A. parthenogenetica) are genetically well differentiated both from the bisexual ones and among them, even when characterised by the same ploidy. Each sample presents...
Tipo: Text
Palavras-chave: Artemia; Allozymes; Reproduction amphigonique; Parthénogenèse; Hétérozygotie; Artemia; Allozymes; Amphigony; Parthenogenesis; Heterozygosity.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00322/43289/43024.pdf

Genetic diversity and environmental stress in Italian populations of the cyprinodont fish Aphanius fasciatus
Provedor de dados: 5
Autores: Cimmaruta, R; Scialanca, F; Luccioli, F; Nascetti, G.
Allozyme electrophoresis has been used to analyse the genetic structure of ten populations of the killifish, Aphanius fasciatus, sampled from Italian coastal brackish lagoons or salterns. The goal of the study was to compare the genetic structure of samples obtained from habitats characterised by environmental stress of different kinds, with the aim of gaining a better understanding of the relationships between the genetic variation of natural populations and environmental disturbance, either natural or man-made. Therefore, the sampling scheme has been planned to provide samples from both brackish habitats, characterised by natural stress with seasonal marked fluctuations of chemical and physical parameters, and from coastal lagoons suffering from a high...
Tipo: Text
Palavras-chave: Aphanius fasciatus; Hétérozygotie; Allozymes; Eaux saumâtres; Stress du milieu; Aphanius fasciatus; Heterozygosity; Allozymes; Brackish waters; Environmental stress.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00322/43290/43025.pdf

Towards the development of clonal lines in the European sea bass (Dicentrarchus labrax L.): application of uniparental reproduction techniques with an insight into sea bass eggs
Provedor de dados: 5
Autores: Colleter, Julie.
Clonal lines are a powerful scientific tool for improved genetic characterization of organisms used in research. Inbred fish lines can be produced in only two generations using uniparental reproduction techniques. Androgenesis, achieved with variable success in several freshwater species, has been attempted in the European sea bass (Dicentrarchus labrax L), a marine fish of commercial and scientific interest. The low yields of progenies inheriting only the paternal genome after UV-irradiation of eggs led to considerations on the occurrence of UV screening compounds in pelagic eggs. Mycosporine-like amino acids and gadusol were found in many marine and freshwater organisms, but their occurrence in fish eggs was not clearly related to a behavioral pattern...
Tipo: Text
Palavras-chave: Dicentrarchus labrax; Lignées clonales; Androgenèse; Gynogenèse; MAAs; Gadusol; Marqueurs microsatellites; Homozygotie; Hétérozygotie; Taux de recombinaison.; Dicentrarchus labrax; Clonal lines; Androgenesis; Gynogenesis; MAAs; Gadusol; Microsatellite markers; Homozygosity; Heterozygosity; Recombination rate.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00300/41138/40326.pdf