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February 11, 1911

Hereditary Characters and Their Modes of Transmission.

JAMA. 1911;LVI(6):451. doi:10.1001/jama.1911.02560060061041

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Recent discoveries and experimental work on cells are applied to problems in heredity with a view to harmonizing the results of the Mendelian experiments with the observations of the biometricians. This is done by showing that some parts of the cells involved in fertilization, that is, in the production of the new individual, are distributed in an alternative manner, while other parts simply divide in bulk. As a fresh hypothesis regarding the problem of sex, Walker suggests that there are two classes of characters, the individual and the racial, which behave in different manner in regard to inheritance. To each he attributes a distinct mode of transmission. He regards sex as a character which has been kept in the category of individual characters and has been prevented from becoming a racial character by the action of natural selection, in spite of the fact that it is far more intense than

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