Effect of Ploidy in Photoreactivation.

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Abstract
The survival fractions of diploid and haploid strains of Saccharomvces cerevisiae after u.-v. irradiation 2537 A.) were obtained, compared, and modified by photoreactivation following the initial irradiation. The haploid survival follows a sigmoid curve and is smaller than the diploid at the same dose. The dose reduction principle (which can be successfully applied to the data) yields a reduction factor that appears substantially the same for photoreactivation of both strains. The data appear consistent with the model proposed by Novick and Szilard.