Heterozygous effects of radiation-induced mutations on viability in homozygous and heterozygous genetic backgrounds in Drosophila melanogaster (Preliminary report)

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Abstract
Heterozygous effects of mutations induced by low doses of X-irradiation on viability were observed both in homozygous and heterozygous genetic backgrounds in Drosophila melanogaster. It was found that the manifestation of heterozygous effect of radiation-induced mutations on viability is influenced remarkably by the genetic background, i.e., in otherwise homozygous genetic background the radiation-induced mutations have, on the average, heterozygously positive effect on viability, while in heterozygous genetic background, a slightly negative effect or almost none is found.