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Mutations: Incidence in Drosophila melanogaster Reared on Irradiated Medium
Abstract:
An increase in the rate of mutation has been found in Drosophila melanogaster reared on a basic medium that was irradiated with a sterilizing dose (150,000 rads) of cobalt-60 gamma rays. In Muller-5 tests, sex-linked recessive lethals occurred only in the F(2) progenies of the male test flies obtained from breeding the parent flies on irradiated medium, while visible changes occurred in experimental cultures from both the control and irradiated media. The frequency of sex-linked recessive lethals was 0.35, 0.55, and 0.8 percent in three independent experiments. Visible changes were two to six times more frequent in the irradiated series than in the controls.
Insights
Irradiated food medium increased mutation rates in Drosophila melanogaster. This study found more genetic mutations, including sex-linked recessive lethals and visible changes, in flies exposed to gamma-irradiated media.
Area of Science:
- Genetics
- Radiation Biology
- Toxicology
Background:
- Environmental factors can influence mutation rates in organisms.
- Gamma irradiation is used for sterilization and its biological effects are of interest.
- Drosophila melanogaster is a model organism for genetic studies.
Purpose of the Study:
- To investigate the effect of gamma-irradiated medium on mutation rates in Drosophila melanogaster.
- To quantify the frequency of sex-linked recessive lethals and visible mutations.
Main Methods:
- Drosophila melanogaster were reared on a basic medium irradiated with cobalt-60 gamma rays (150,000 rads).
- Muller-5 tests were employed to detect sex-linked recessive lethals.
- Visible mutations were also assessed in experimental and control groups.
Main Results:
- An increased mutation rate was observed in flies reared on irradiated medium.
- Sex-linked recessive lethals were detected in the F(2) generation of males from parents on irradiated medium.
- Visible mutations occurred more frequently (2-6 times) in the irradiated series compared to controls.
Conclusions:
- Exposure to gamma-irradiated medium significantly increases mutation rates in Drosophila melanogaster.
- The study highlights the potential genetic risks associated with irradiated environments.
- Further research is warranted to understand the mechanisms of radiation-induced mutagenesis.
