Abstract
Short-wavelength light renders the compound eye of the white-eyed mutant of Drosophila melanogaster refractory. Sensitivity returns after more than 3 hr in the dark, or almost immediately following exposure to longwavelength light. Thus it is possible to switch the eye off and on. The form of the ERG is distinct for the two categories of lights; in contrast with longwavelength light, short-wavelength light evokes virtually no off-effects and the receptors remain depolarized. Red eye-colour pigments obscure the effect in the wildtype eye.
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