Heredity in man / by R. Ruggles Gates.

  • Gates, R. Ruggles (Reginald Ruggles), 1882-1962.
Date:
1929
Catalogue details

Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: Heredity in man / by R. Ruggles Gates. Source: Wellcome Collection.

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    RACIAL GROSSING 337 light brown and slightly wavy. The older sister (Martina), who was not seen, was said to be not quite white, with eyes light brown and hair medium brown and wavy. Hence in this back-cross of the to white we have three daughters, all one-quarter Eskimo, one of them with the white skin and Nordic hair and eyes of her father ; another very similar to the mother ; and a third intermediate. There is no absolute certainty that the Eskimo grandmother was pure- blooded, as there has been much crossing with whites in Alaska, Fig. 74.—Half-Eskimo Mother and Two Quarter-Eskimo Daughters, showing Segregation. but her features show no indication of hybrid mixture. If she is pure, and the back-cross gave segregation only between the white type of Ida and the half-colour of Bessie and the mother, then we should assume a single set of linked fadors for these differences in skin, hair, and eye colour. But Martina appears to have been definitely intermediate, and so it may be necessary to postulate, not a set of linked monohybrid fadors, but perhaps one or more endocrine differences which are also capable of being fradionated. This baffling combination of sharp segregation in certain 22