Abstract
In October 1954, Mori and his collaborators isolated a number of wild-type strains of Drosophila melanogaster and placed then in constant darkness. We have investigated the mate recognition system of individuals from these strains by comparing them with control strains. Mating activity rhythms for each strain were determined by measuring their mating propensity. Deviation in mate recognition was measured at times when "eagerness" of the "dark" lines and their controls were comparable. Our results show that despite such a long period under unusual environmental conditions the mate recognition system of individuals from "dark" strains had not significantly changed from their controls.
