. Plant genetics . Heredity; Mendel's law; Plant breeding. o o © ® Q O ® ® Q_0 Fig. 4.—Diagram illustrating behavior of first hybrid generation (F,) when inbred. Illustrates meaning of "segregation" and "purity of gametes,'' and how chance matings of Fi gametes result in 3:1 ratio in Fz generation; dwarf individual produced only by zygote in lower right-hand comer. it is evident that the 3: i ratio of the F2 generation is really a 1:2:1 ratio, as follows: i homozygote for the dominant character, 2 heterozygotes, and i homozygote for the recessive character. The 1:2:1 ratio there
. Plant genetics . Heredity; Mendel's law; Plant breeding. o o © ® Q O ® ® Q_0 Fig. 4.—Diagram illustrating behavior of first hybrid generation (F,) when inbred. Illustrates meaning of "segregation" and "purity of gametes,'' and how chance matings of Fi gametes result in 3:1 ratio in Fz generation; dwarf individual produced only by zygote in lower right-hand comer. it is evident that the 3: i ratio of the F2 generation is really a 1:2:1 ratio, as follows: i homozygote for the dominant character, 2 heterozygotes, and i homozygote for the recessive character. The 1:2:1 ratio therefore is the significant one and appears as a 3:1 ratio only because of dominance. In the experiment represented in fig. 4 three tall individuals appear in the F2 generation. Superficially the individuals look alike, but it is realized that i differs. 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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