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Behavioural traits of the fruitfly Drosophila are studied as regards their neuronal aspects by appropriate investigation of individual flies, and as regards their genetic aspects by appropriate investigation of population samples. A countercurrent distribution method and a selection-by-inspection method have been developed in order to isolate phototactically deficient mutants from the progeny of the chemically mutagenized homogeneous wild type populations (Benzer, 1967; Pak, Grossfield & White, 1969). Multiple T-mazes and related devices have been used to fractionate heterogeneous populations according to their geotactic or phototactic reactions (Hadler, 1964a, b ; Hirsch, 1967; Hostetter & Hirsch, 1967; Dobzhansky & Spassky, 1967; Dobzhansky, Spassky & Sved, 1969; Murphey & Hall, 1969), according to their spontaneous activity (Levine & Kessler, 1965; Connolly, 1966, 1967) and according to their optomotor response (Siegel & Hirsch, 1963; Siegel, 1967).
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KG Götz (1970) studied this question.
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