Abstract
1. 1. Under the conditions of these experiments, the ultraviolet curves for haploid, diploid, triploid, and tetraploid yeasts are all sigmoid. 2. 2. The average rate of logarithmic inactivation for each ploidy class is greater the greater the degree of polyploidy. 3. 3. The response of Saccharomyces to ultraviolet irradiation is not determined primarily by the number of chromosome sets present. Individual strains within any ploidy class show characteristic rates of logarithmic inactivation. Some strains exhibit rates which diverge so widely from their class mean as to overlap the mean values for other classes. 4. 4. The length of the induction phase prior to the onset of logarithmic inactivation is not directly dependent upon ploidy. However, the rate at which the induction phase passes into the phase of logarithmic inactivation increases with increasing polyploidy.
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