Abstract
AbstractThree inter‐fertile wild races of Euplotes minuta, which differ with respect to the maximal number of kineties expressed in a clone, were subjected to a breeding analysis. The data obtained in this analysis suggest a genic control of the differences in cortical pattern. Evidence for the operation of a cytotactic mechanism for short‐term perpetuation of kineties was also obtained.Investigation of cellular features, possibly related to the mode of action of this genic control, established no direct relationship between kinety number and fission rate or cell size. Some evidence was, however, found for a genic control of the total number of kinetosomes, and this might be related to the control of the number of kineties. A mechanism, by which kineties are gained and lost, is proposed and evidence for this mechanism is provided.The relation between cytotaxis and the genic control of the range of kinety number is discussed, and the conclusion is reached that cytotaxis helps to perpetuate existing surface patterns, whereas long‐range control of the most stable kinety number is nevertheless genic.
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