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PubMed1974

Interaction between mendelian and non-mendelian genes. Regulation of the transmission of non-mendelian genes by a mendelian gene in Chlamydomonas reinhardtii.

The non-Mendelian genetic element of a given mating type of Chlamydomonas reinhardtii was first doubly marked by succesive mutageneses and then transferred into a number of offspring cells of the opposite mating type. In subsequent crosses of these offspring clones, the transmission pattern of the original non-Mendelian markers was analyzed. The results indicate that the mating-type gene of a given cell regulates the transmission and perhaps the recombination of the non-Mendelian genes regardless of whether the non-Mendelian markers were isolated originally in the same cell or obtained from another cell of the opposite mating type through genetic transmission. The regulation of the transmission of non-Mendelian genes in C. reinhardtii is thus apparently different from the autonomous control of the transmission of non-Mendelian mitochondrial genes in yeast by a genetic factor located on the mitochondrial genome.

Chlamydomonas↗
PubMed1974

Selection for high mutation rates in chemostats.

Competition experiments in chemostats show that mutator populations of Escherichia coli are more fit than wild type. The increased fitness can be explained by the appearance of new mutants better adapted to the chemostat environment. Fitness values vary between chemostats and are strongly correlated (P < 0.001) with fluctuations in population density.

Bacteriological Techniques↗