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Shrew After Remova n/r. SNYDER Department Neo 1. T. DIAMOND Durham, North Carola 27706 of Psychology, University, ATTEMPTG TO TRACE the phylogeny of color vision vertebrates it is necessary to distguish two factors: retal mechanisms the central nervous system structures responsible for translatg the differences the afferent signal to behavior. Retal mechanisms for color are homologous all vertebrates the sense that the potentiality for identical photosensitive pigments is common to all species must therefore be attributed to their common ancestor (14). Apparently only a few genes control the last few chemical steps which make the difference between actualizg the potential fallg short of it sce the complete set of pigments seems to be a trait easy to lose easy to reacquire phyletic history. It is even possible for one eye a sgle dividual to possess the full equipment while its mate is color-bld (3). No wonder closely related species differ their ability to perceive hue. One might expect that a nocturnal way of life, for example, must change the balance between selective pressure mutation rate on those alleles which control the production of photosensitive pigments, as a result any population occupyg such a niche might lose the necessary
Journal of Neurophysiology – The American Physiological Society
Published: Jul 1, 1969
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