Reversion in Guinea-Pigs and Its Explanation, And, Experimental Studies of the Inheritance of Color in Mice (Classic Reprint) - Couverture souple

Castle, W. E.

Couverture souple

ISBN 10 : 1333097093 ISBN 13 : 9781333097097

Editeur : Forgotten Books, 2018

A propos du livre

Présentation de l'éditeur

KiS AND ITS EXPLANATION. In 1905 I showed that when black-coated guinea-pigs of pure race are mated with red-coated ones only black-coated young are ordinarily produced, and that if such young are in turn mated with reds, both black young and red ones are obtained. In other words, black is a mendelian dominant to red. The fact was, however, noted that occasionally the cross of black with red causes reversion to the agouti or wild type. But this may be regarded as a modified condition of black, since the hairs of the agouti animal contain black pigment, but disposed in a definite pattern with red, the entire hair being black except a terminal or subterminal band of red (or yellow). An examination of the tables of matings published at that time shows that all the agouti animals so produced were the progeny of a single red animal, 62054. This animal produced black young as well as agouti ones in crosses with black, so it was not clear to what the reversion was due. By a study of the progeny of this animal the matter was later cleared up. The black young were found never to produce agouti young in crosses with any red animals unless such reds were descended from c? 2054. The agoutis, however, produced a mixture of agoutis, blacks, and reds, when mated with ordinary red animals. These and other corroborating experiments, reported briefly in 1907, showed that the agouti reversion in crosses of black with red is due to a factor transmitted by the red parent, never by the black one. For, as I then showed: (1) a red animal which produces the reversion to agouti in crosses with one black animal will produce it in crosses with any black animal; but (2) no black animal will produce agouti young unless crossed with a red animal which also produces agouti young in crosses with other black animals. For simplicity, the something possessed by red animals which induces revers
(Typographical errors above are due to OCR software and don't occur in the book.)

Détails de l'édition

• Éditeur: Forgotten Books
• Date d'édition: 2018
• Langue: anglais
• ISBN 10: 1333097093
• ISBN 13: 9781333097097
• Reliure: Broché
• Nombre de pages: 118
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