Abstract
A method for measuring the influence of light on pupation site preferences, PSP, of late-third-instar Drosophila is described. Wild-type strains of D. melanogaster all are characterized by dark PSPs. Strains of flies having mutations that render adults blind due to structural abnormalities of the compound eye show no alterations in PSP. Flies carrying the mutant trpCM also show normal PSPs. However, severe mutations at the norpA locus appear to leave larvae blind as well as cause blindness in adults. The norpA locus is believed to control a protein intermediate in the phototransduction process. It is hypothesized that the step controlled by the norpA locus is common to the photoreceptors of both larvae and adult flies. Genes controlling structural components of the compound eye of adults are evidently not important for light-dependent behavior in preimaginal stages.
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