. Bulletin. 1901-13. Agriculture; Agriculture. SIMULTANEOUS CHANGES OP EXPRESSION. 73 vidiial i^lants of a progeny vow. Thus at Barcl, Cal., in the season of 1911, a phmt of Egyptian cotton with numerous abnormal bracts but no other obvious di vergence from tlie charac ters of the Yuma variety was found on closer exam- ination to have seeds much like the Hindi cotton. There was no fuzz, and the lint retained the length and color of the Egj'ptian cotton, so that it would have been easy to overlook the other differences if the abnormal bracts had not been noticed. SIMULTANEOUS CHANGES OF EXPRESS
. Bulletin. 1901-13. Agriculture; Agriculture. SIMULTANEOUS CHANGES OP EXPRESSION. 73 vidiial i^lants of a progeny vow. Thus at Barcl, Cal., in the season of 1911, a phmt of Egyptian cotton with numerous abnormal bracts but no other obvious di vergence from tlie charac ters of the Yuma variety was found on closer exam- ination to have seeds much like the Hindi cotton. There was no fuzz, and the lint retained the length and color of the Egj'ptian cotton, so that it would have been easy to overlook the other differences if the abnormal bracts had not been noticed. SIMULTANEOUS CHANGES OF EXPRESSION OF DIFFERENT CHARAC- TERS. The emphasis given tx) the idea of characters as independent units tends to obscure another fact of general importance in prac- tical breeding. Independ- ent transmission of char- acters implies the occur- rence of definite varia- tions in single characters, leaving all the other fea- tures the same. In reality, such independent changes of single characters occur very seldom, if at all. The nature of the mech- anism of expression is such that a definite change in one character usually in- volves changes in many other characters. A change of expression does not seem to represent merely a choice among many independent units, but a choice among whole sets of characters 256. Fig. G.—Bractliko leaf of Egytian cotton, with the blade and petiole reduced and the stipules en- larged. (Natural size.). 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. Bureau of Plant Industry, Soils, and Agricultural Engineering. Washington Govt. Print. Off
Size: 1021px × 2447px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookpublisherwashingtongovtprintoff, booksubjectagriculture
