. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. Fig. •% '97 '93 '99 '00 '01 '02 '03 '04 '05 'Oe '07 'OS '09 '10 '11 '12 '13 'U '15 Year of Selection -Two graphs representing the effects of selection for high and low oil content in the Illinois Station corn experiments. (Data from Castle.) ear and number of internodes above the ear. Fig. 135 shows the result of selecting for high and low ears during five generations. Similar results were obtained from selection in the case of position of ear at maturity and total yield. The striking results
. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. Fig. •% '97 '93 '99 '00 '01 '02 '03 '04 '05 'Oe '07 'OS '09 '10 '11 '12 '13 'U '15 Year of Selection -Two graphs representing the effects of selection for high and low oil content in the Illinois Station corn experiments. (Data from Castle.) ear and number of internodes above the ear. Fig. 135 shows the result of selecting for high and low ears during five generations. Similar results were obtained from selection in the case of position of ear at maturity and total yield. The striking results of these carefully conducted experiments have been cited by various authors as evidence par excellence for the most. •90 '97 '98 'Sa '00 'Ol '02 '03 '01 '05 '06 '07 '03 '09 '10 'U '12 '13 '11 '15 Year of Selection Fig. 134.—Two graphs representing the effects of selection for high and low protein con- tent in the Illinois Station corn experiments. (Data from Castle.) diverse conceptions of the role which selection plays in evolution and breeding. Thus the earher allusions of Hopkins and Smith, the discus- sion in E. Davenport's on breeding, and the recent treatment by Castle all seem to attribute a peculiar creative power to selection which meets with a certain "response" on the part of the plant. This is in hne with the Darwinian idea that all fluctuating variations are heritable and that the continuous selection of minor fluctuations in a certain direction is always effective in shifting the type. Digitized by Microsoft®. 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 Babcock, E. B. (Ernest Brown), b. 1877; Clausen, Roy Elwood, 1891-. New York, McGraw-Hill; [etc. , etc. ]
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