. Contributions from the Laboratory of Plant Genetics. No. 565] CHANGES PRODUCED BY SELECTION 21 24 leaves, and as the strain indicated that it was hetero- zygous for a number of factors by showing a coefficient of variability of ± .42 per cent-, it is possible that the selected parent plant may have belonged gametically to a higher class than was indicated somatically; nevertheless, it can not be denied that three generations of selected minus extremes have produced no results. This conclu- sion is not valid for the plus strain. Starting with =h .10 as the mean number of leaves (F5)
. Contributions from the Laboratory of Plant Genetics. No. 565] CHANGES PRODUCED BY SELECTION 21 24 leaves, and as the strain indicated that it was hetero- zygous for a number of factors by showing a coefficient of variability of ± .42 per cent-, it is possible that the selected parent plant may have belonged gametically to a higher class than was indicated somatically; nevertheless, it can not be denied that three generations of selected minus extremes have produced no results. This conclu- sion is not valid for the plus strain. Starting with =h .10 as the mean number of leaves (F5), the succeeding gen- erations had means of ± .07 leaves, ± .11 leaves and ± .11 leaves. The differences are ,1-2 and leaves, respectively. Progressive change has certainly f ol-. Fig. 3. Change of Phyllotaxy in Some Plants of (77-2)-1-1 Grown in New Haven in 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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