. Breeding crop plants. Plant breeding. 164 BREEDING CROP PLANTS "4. 'VSTien a sufficient number of F2 individuals are available, the grandparental types should be recovered. "5. In certain cases individuals should be produced in Fz that show a more extreme deviation than is found in the frequency distribution of either grandparent. "6. Individuals from various points on the frequency curve of an F^ population should give Fa populations differing markedly in their modes and Fig. 36.—A, A', alala prandiflora: B, F\ of N. langsdorfii X N. alata grandi- fora; C, .V. langado
. Breeding crop plants. Plant breeding. 164 BREEDING CROP PLANTS "4. 'VSTien a sufficient number of F2 individuals are available, the grandparental types should be recovered. "5. In certain cases individuals should be produced in Fz that show a more extreme deviation than is found in the frequency distribution of either grandparent. "6. Individuals from various points on the frequency curve of an F^ population should give Fa populations differing markedly in their modes and Fig. 36.—A, A', alala prandiflora: B, F\ of N. langsdorfii X N. alata grandi- fora; C, .V. langadorfii (1911); D and E, extremes of the F2 generation (1912) X ''7. Individuals either from the same or from different points on the frequency curve (jf an F-z population should give Fs populations of diverse varialjilities extending from that of the original parents to that of the F2 generation. "S. In generations succeeding the F->, the varial)ility of any family may be less but never greater than the variability of the population from which it ; All of the above Gight conditions have been obtained in experi- and no fact directly opposed to them has been discovered.^ The quantitative characters in tobacco which have been studied are, therefore, typically Mendelian in their 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 Hayes, Herbert Kendall, b. 1884; Garber, Ralph John, b. 1890. New York [etc. ] : McGraw-Hill book company, inc.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectplantbr, bookyear1921
