To determine the effects of repeated exposures to microwaves on the frequency of lethal mutations in Drosophila melanogaster. The fertility of irradiated individuals and the sex ratio of their offspring were also investigated.
Four lethals were found in treated groups but their frequency was not significantly different from that of the controls. No cumulative effect of repeated exposures on the mortality of the exposed males was observed. On the contrary, their mortality decreased with the number of exposures. Exposition did not affect the sex ratio of the F1. A significant decrease in the number of F1 progeny was noted in the group exposed to the power density of 15 W/cm². A negative thermal effect of microwaves on male germ cells was probably manifested by this long exposure.