. Contributions from the Laboratory of Plant Genetics. 324 E- M- EAST that of the average of the square roots of the means of the two parents, but I do not feel justified in attaching any significance to the fact. The coefficient of variation of the F2 generation is nearly three times that of the F1 generation. Though extremes like each parent were not produced, it is hardly possible to see any other cause for this great difference in variability than segregation and recombination of Mendel- ian factors. From the theory of probability one might expect to recover. Figure 5. F, extreme of the F:
. Contributions from the Laboratory of Plant Genetics. 324 E- M- EAST that of the average of the square roots of the means of the two parents, but I do not feel justified in attaching any significance to the fact. The coefficient of variation of the F2 generation is nearly three times that of the F1 generation. Though extremes like each parent were not produced, it is hardly possible to see any other cause for this great difference in variability than segregation and recombination of Mendel- ian factors. From the theory of probability one might expect to recover. Figure 5. F, extreme of the F:; generation, and G. pure A*, alata grandiflora (1913) X V2. both parents with a comparatively small number of F2 plants, but the variability of F1 is so small that even the plants obtained in F2 could not be expected in the F1 if the whole of Xew England were planted with them. In the F3 generation there was regression toward the mean of the F2 population in six out of seven cases ( excluding Xo. 1-5 on account of the small number of plants), but the greatest extremes gave the least regres- sion. The coefficients of variability were lower than that of F2 in every family, and three of them bred as true as the parental species. F3 family Xo. 1-7 reproduced N. Langsdorffii exactly. The Mendelian theory calls for the production of the same type of F2 population no matter what F1 parent is selected, when the original individuals entering the cross are homozygous. Critics of the use of the Mendelian terminology in crosses involving size characters have maintained, however, that small F1 individuals will give F2 populations. 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 Bussey Institution. Boston : [s. n. ]
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