The genus Saccharomyces consists of several species divided into the sensu stricto and the sensu lato groups. The genomes of these species differ in the number and organization of nuclear chromosomes and in the size and organization of mitochondrial DNA (mtDNA). In the present experiments we examined whether these yeasts can exchange DNA and thereby create novel combinations of genetic material...

We investigate the question of naturally occurring interspecific hybrids between two forest trees: the native North American butternut (Juglans cinerea L.) and the introduced Japanese walnut (Juglans ailantifolia Carrière). Using nuclear and chloroplast DNA markers, we provide evidence for 29 F(1) and 22 advanced generation hybrids in seven locations across the eastern and southern range of the...

The paper presents brief biological characteristics of the main objects pond farming carp, white silver mottled carp and their interspecific hybrids. food value chemical composition fathead meat its use as raw material in production essential low-calorie foodstuffs are given.

accompanying forest species by nitrogen supply. The genus Alnus includes some fast-growing species adapted to various ecological situations (Martin, 1985). Genetic improvement programs are being developed to produce effective clonal varieties able to grow under various ecological conditions. Controlled hybridizations (intraspecific and interspecific) were carried out to obtain improved progenie...