Einiges vom Wiener Wild- und Vogelmarkte

Ohne Zusammenfassung     

Restriction fragment length polymorphism of the caprine ß-globin gene cluster associated with the Hb ß-globin variants in Norwegian dairy goats

Restriction fragment length polymorphism (RFLP) analysis was used to characterize the beta-globin cluster in Norwegian dairy goats. In 122 individuals, different RFLP patterns were detected after BglII and PstI digestion and hybridization with a caprine beta-globin probe. The location of the polymorphic BglII and PstI sites were determined. The different RFLPs were in linkage disequilibrium with each other and with the beta-globin locus as studied at the protein level. A preferential association between certain RFLP haplotypes and beta-globin variants was observed. Polymorphic DNA fragments in the epsilon-globin genes were detected after MspI digestion and hybridization with a caprine epsilon-probe, and eight different band patterns were observed. Correlation between different MspI haplotypes and the beta-globin variants was determined.     

Restriction fragment length polymorphism of a bovine T-cell receptor ß gene

Genetic polymorphism of a bovine T-cell receptor beta gene was investigated by analysing restriction fragment length polymorphism (RFLP). One locus, denoted TCRB, with four allelic variants was revealed. The relationship between alleles at the TCRB locus and bull breeding values for disease and milk production was investigated in a sample of 196 progeny-tested AI bulls of the Swedish Red and White breed. The statistical evaluation of the data revealed no convincing association between TCRB alleles and any of the traits studied.     

Introgressive Hybridisation,Sippenbildung und Vegetationsänderung

Introgressive hybridization is a phenomenon, which takes place in natural conditions, on vast territories, during thousands of years and connected with paleogeographic events. The introgressive hybridization usually involves not only certain pairs of species in a definite region, but many species. Species, pertaining to different specific rows or different sections of genus enter into the introgression. Hybrid forms, having arisen in the process of introgression are of low stability. Change of climatic conditions leads to absorption of hybrid by those ancester-parents, for which this change is most favourable. The absorption by one species edificator of his own hybrid populations reflects the displacement of one vicaring formation by another. The introgressive hybridization, which has been occuring during the tertiary time and has lead to speciation nowadays presented in classification by sectional level (Picea sect. Omorika, Larix sect. Multiseriales), has not created new stable lines of development. Introgressive hybridization in cases known, as well as in examples of Picea and Larix has not opened and is not opening new evolutional perspectives.