. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 42 BULLETIlsr I5i, V. S. DEPARTMENT OF AGRICULTURE. a failure of dominance in some of the seeds or a deficiency on the part of the male parent of gametes bearing one of the color factors. This deficiency could be due to a differential death rate, a les- sened vigor resulting in a slower growth of the pollen tube, or to a failure of the plant to produce gametes in equal proportions. It will be recalled that the plants heterozygous for colored aleurone are pre- sumed to be making two classes of gametes, OE and Or; a defi
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 42 BULLETIlsr I5i, V. S. DEPARTMENT OF AGRICULTURE. a failure of dominance in some of the seeds or a deficiency on the part of the male parent of gametes bearing one of the color factors. This deficiency could be due to a differential death rate, a les- sened vigor resulting in a slower growth of the pollen tube, or to a failure of the plant to produce gametes in equal proportions. It will be recalled that the plants heterozygous for colored aleurone are pre- sumed to be making two classes of gametes, OE and Or; a deficiency of white seeds when plants of this nature are used as male parents on plants making one class of gametes (Cr) indicates a deficiency of gametes bearing Or. The relations of those ears are shown in figures 4 and 5. The large deviation for the total seeds of the 29 ears is due to a great extent to the three ears that deviated by more than seven times the probable error. These ears must stand as definite excep-. Pec/. /ess //OS /702 Fig. 5.—Diagram showing the relations of ears Nos. 1653, 1703, and 1702. tions to the general agreement of the material with theory, but since they stand rather apart from the remaining ears it may be well to exclude them and then examine the totals. Omitting the data relating to these ears from the total number of seeds for the 29 ears, the percentage of white becomes This deviation is times the probable error and is still too large to occur as the result of chance. That there is a tendency toward too few A^iiite seeds when heterozygous colored plants are used as male parents is demonstrated for this group, even omitting the ears with obviously aberrant 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 United States. Dept. of Agriculture. [Washington, D. C
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