THE WHOLE- AND FRACTIONAL-COLONY MUTATION INDUCED BY SOFT X-RAYS IN YEAST

Abstract

and Yamasaki et al. (1963) reported that in diploid yeast cells, two types of mutation, fractional-and whole-colony, probably corresponding to the single-and double-strand change of DNA molecule, are induced by various mutagenic agents, that is, high temperature, UV, and chemicals such as hydroxylamine and acridine orange plus visible light. By X-rays, similar production of frac-