. Plant genetics . Heredity; Mendel's law; Plant breeding. Modification of Unit Characters 107 the pure stock (the diameter of the circle referred to) is indicated by . Of course, even "pure stock" varies somewhat, since no two individuals are. The Control Fig. 27.—Diagram illustrating Castle's selection experiment with hooded rats. exactly alike, biology recognizing what is called "indi- ; The point, however, is that the compara- tively small variation in a pure stock is not due to germinal differences but to responses called out by varying external conditions, s


. Plant genetics . Heredity; Mendel's law; Plant breeding. Modification of Unit Characters 107 the pure stock (the diameter of the circle referred to) is indicated by . Of course, even "pure stock" varies somewhat, since no two individuals are. The Control Fig. 27.—Diagram illustrating Castle's selection experiment with hooded rats. exactly alike, biology recognizing what is called "indi- ; The point, however, is that the compara- tively small variation in a pure stock is not due to germinal differences but to responses called out by varying external conditions, such as nutrition, light, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Coulter, John Merle, 1851-1928; Coulter, Merle C. (Merle Crowe), 1894-1958. Chicago : The University of Chicago Press


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