The Journal of General Physiology
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The Journal of General Physiology, Vol 19, 211-219, Copyright © 1935 by The Rockefeller University Press

ARTICLE

ANALYSIS OF THE GEOTROPIC ORIENTATION OF YOUNG RATS. IX

W. J. Crozier 1 and G. Pincus 1

1 From the Biological Laboratories, Harvard University, Cambridge

Adult hybrid rats from the cross of races A x B show a total capacity to vary their geotropic performance which is identical with that of their B parents. The proportionate modifiable variability of geotropic orientation also agrees quantitatively with that for the B parents. These relationships are not disturbed by the action of adrenin, which leads to a distortion of the theta vs. alpha curve. Young rats of the F1 generation show a greater proportion of unmodifiable variation of geotropic orientation. It is pointed out that the present findings support the conclusion that the capacity of rats to exhibit variation of geotropic orientation is limited by their genetically determined composition and that the special condition in the young hybrids may be understood as due to a kind of temporary disharmony of developmental events.

Accepted on April 9, 1935


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