Heredity of Hair Length in Guinea Pigs And Its Bearing On the Theory of Pure Gam
Heredity of Hair Length in Guinea Pigs And Its Bearing On the Theory of Pure Gam
William E William Ernest Castle
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Rarely does a 8 HEREDITY OF HAIR-LENGTH IN GUINEA-PIGS. hair attain a length of 200 mm. As the longest hairs are shed, new ones are found to be growing up to take their places, but there is usually a period, after shedding sets in and before the second-growth hairs are fully devel- oped, when the maximum coat length shows a decided falling off. This is indicated in D, Fig. 2, as occurring at about the age of two hundred and and fifty days. The type of hair growth found in class D may be called ...indeterminate or continuous; that of class A, determinate. Kge in days Age da /S FIG. 2. Our original stock of short-haired guinea-pigs showed considerable variation in maximal hair-lengths, ranging from 35 to 50 mm. , but all of the determinate type of growth (classes A and B, Fig. 2). The great majority of them would probably have fallen in class B, but we can not be sure of this, as many of the animals were no longer available for record when we began making hair-measurements systematically. The hair-lengths recorded for class A are certainly exceptionally short, even for animals of determinate hair growth.
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