. Plant genetics . Heredity; Mendel's law; Plant breeding. 44 Plant Genetics Mirabilis Jalapa, the common four-o'clock. Correns crossed red and white varieties, and all the hybrid progeny had rose pink flowers. This was a color blend, distinctly intermediate between the colors of the two parents. The Fi generation, therefore, seemed to con- tradict Mendel's law in that one color character was not completely dominant over the other. The real situa- tion, however, appeared in the Fj generation obtained by. Fig. 8.—Diagram illustrating blending inheritance, discovered by Correns in Mirabilis Jala
. Plant genetics . Heredity; Mendel's law; Plant breeding. 44 Plant Genetics Mirabilis Jalapa, the common four-o'clock. Correns crossed red and white varieties, and all the hybrid progeny had rose pink flowers. This was a color blend, distinctly intermediate between the colors of the two parents. The Fi generation, therefore, seemed to con- tradict Mendel's law in that one color character was not completely dominant over the other. The real situa- tion, however, appeared in the Fj generation obtained by. Fig. 8.—Diagram illustrating blending inheritance, discovered by Correns in Mirabilis Jalapa. inbreeding individuals of the Fi generation which showed the blend. By inbreeding the pink hybrids Correns obtained the perfect 1:2:1 ratio, that is, i red like one grandparent, 2 pink Uke the hybrid parent, and i white like the other grandparent. Segregation was evidently taking place, the only unusual thing being the appear- ance of the Fi individuals, and that was explained im- mediately as failure of dominance (see fig. 8).. 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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