[Chromosome polymorphism in the yeast Saccharomyces].

The variability of chromosomal band patterns was determined by pulse electrophoresis. The natural strains differed by the quantity and electrophoretic mobility of chromosomal DNA bands. The strains of independent genetic stocks originated from the XII race of Saccharomyces cerevisiae showed less significant difference in band patterns than the strains of different species of the Saccharomyces genus.

[Genetic control of the number of copies of type K2 killer plasmids in Saccharomyces cerevisiae].

13 non-linked chromosomal mutations derepress the negative genetic control of copy number of K2 yeast killer plasmids and lead to 1.5-2-fold elevating of copy number of that type plasmids -L2A and M2 virus-like dsRNA. The content of both plasmids is increased 3-5-fold in cells with chromosomal ski5 mutation, as compared to the strains of wild type.