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It is generally believed that recombination by sexual reproduction is unfavourable in constant environments but is of adaptive value under changing environmental conditions. To test this theory, experimental populations of yeast (Saccharomyces cerevisiae) were set up and maintained at different levels of environmental heterogeneity. Recombination was… (More)
From 1976 to 1978 nine aphid species were investigated electrophoretically. A low degree of polymorphism was found. Only 5 of the species were polymorphic, and only at most in 3 enzyme systems out of 19.
No segregants were found amongst 2343 descendants from 35 different clones of the aphidMacrosiphum rosae (L.). The clones were heterozygous with respect to the enzymes malate dehydrogenase and/or phosphoglucomutase.
This paper deals with the properties of a two-locus model constructed according to the lifecycle of the yeast Saccharomyces cerevisiae. In addition to the mating-type locus with two alleles, a second locus with two alleles was assumed. Further, we considered that the population can be composed of haploid and diploid cells. Of the population parameters… (More)
Aspects of the stability of the host-pathogen interaction of baculoviruses Risk assessment of genetically modified plants introduced into the environment A. Dietz 209 Treatment of human disorders with gene therapy and its consequences for the human gene pool Hj. Müller 229 The release of microorganisms-ethical criteria D. Mieth 245 Summary Current theories… (More)
Herz e inf l iegende ]31ut r u n d 37 bis 40 ~ C w a r m ist . b) E ine e infachere , aber u n g e n a u e r e Me thode b e s t e h t dar in , die obere K6rpe rh~ l f t e n n t e r e ine K a l t w a s s e r d u s c h e zu legen. A u c h h i e r m i t s che in t e ine aus re i chende K d h l l e i s t u n g er re icht zu werden . Die bei u n s e r e n V e r… (More)
Using two different buffer systems and up to 6 different electrophoretic polyacrylamide gel concentrations, hidden enzymatic variability was investigated in samples of the rose aphid Macrosiphum rosae. MDH1, PGM1, SDH, EST and LAP were found to be polymorphic. No additional variation was observed by changing the test conditions compared to those of earlier… (More)
A new fitness function is proposed. It is a balance function which results from a combination of a turnover function defining the expression of favourable genetic factors and a cost function describing the costs of metabolism. A favourable genetic factor is defined as the heterozygote state at a locus. Five loci with two alleles each are considered. In… (More)
A simple mathematical model is analyzed which describes the behaviour of a population under the influence of viability and fertility as well as carrying capacity and competition by another species. One locus with two alleles determining viability, fertility, and carrying capacity is considered. Throughout the analysis absolute rather than relative numbers… (More)