SummaryPrevious work has shown that the inheritance of ascospore size in certain strains of Neurospora crassa is controlled by a polygenic system with a small cytoplasmic component. Various types of selection lines were set up in strains that had been selected for the large· spored character. The results of these selection procedures are discussed. Experimental work which gives a better estimate of the linkage of part of this polygenic system to the albino locus on chromosome I is reported.
Various types of selection with respect to ascospore length were practised with wild-type strains of Neurospora crass(L. The effect of all types of selection over 11 generations was essentially the same. A significant increase in mean ascospore length, a tendency for a decrease in the coefficient of variation, and a decrease in fertility were observed in each case. These results are discussed and a hypothesis to explain them is put forward.
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