Open-Field Behavior in Mice: Evidence for a Major Gene Effect Mediated by the Visual System

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Abstract
In segregating F 2 , F 3 , and F 4 generations, albino mice had lower activity and higher defecation scores than pigmented animals when tested in a brightly lighted open field. These differences persisted when members of an F 5 generation were tested under white light, but largely disappeared under red light. Thus it was concluded that there is a major gene effect on the quantitative traits of open-field activity and defecation which is mediated by the visual system and that albino mice are more photophobic than pigmented mice under conditions of bright illumination.

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