. Plant genetics . Heredity; Mendel's law; Plant breeding. ISO Plant Genetics Endospenii of East's red and purple corn, the colors being located in the aleurone. There is another phase of this situation to which attention should be called. By pollinating the silks of a white-grained individual with pollen from a red- grained individual xenia is secured, the resulting grains being red like those of the pollen parent. In the recip- rocal cross, however, that is, polUnating silks on a red- grained individual with pollen from a white- grained individual, a differ- ent result is obtained. The resul
. Plant genetics . Heredity; Mendel's law; Plant breeding. ISO Plant Genetics Endospenii of East's red and purple corn, the colors being located in the aleurone. There is another phase of this situation to which attention should be called. By pollinating the silks of a white-grained individual with pollen from a red- grained individual xenia is secured, the resulting grains being red like those of the pollen parent. In the recip- rocal cross, however, that is, polUnating silks on a red- grained individual with pollen from a white- grained individual, a differ- ent result is obtained. The resulting grains are not white like those of the pollen parent, but red like those of the ovule parent. There is no xenia, there- fore, for the pollen has no immediate effect upon the developing endosperm. This seeming difficulty, however, is easily explained. When the pollen parent is white and the ovule parent is red, the endosperm gets its characters from both parents, and since red is domi- nant over white the resulting endosperm will be red because the female nuclei that entered into the triple fusion carried the factor for red endosperm; and there- fore the pollen from the white parent seemed to have no effect. The mechanism works in all cases, but owing to dominance, xenia appears only in certain cases. There is no need to discuss all of the Mendehan situations in which xenia may occur. An understanding of the. Embryo Cross-Section o( Corn-Seed Fig. 35.—Diagram of corn seed. 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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