. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. VARIATION 27 cases in which new lieritable characters have been artificially produced by carefully controlled external stimuli. Hence some germinal variations are apparently caused by known environmental conditions and wo are justified in recognizing this third category of developmental differences due to environmental effects. Considerable evidence of permanent changes in both morphological and physiological characters has been secured from experiments with the culture of bacteria and yeast, in un
. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. VARIATION 27 cases in which new lieritable characters have been artificially produced by carefully controlled external stimuli. Hence some germinal variations are apparently caused by known environmental conditions and wo are justified in recognizing this third category of developmental differences due to environmental effects. Considerable evidence of permanent changes in both morphological and physiological characters has been secured from experiments with the culture of bacteria and yeast, in unusual Culture media, in the presence of toxic solutions, or under extreme temperature conditions. The sig- nificant results of four investigators who worked independently, Hansen, Barber, Wolf and Jordan, have been reviewed and discussed in regard to their bearing on genetic theory by Cole and Wright. The four investi- gators mentioned above used refined methods and three of them began by isolating a single organism from whose progeny they obtained dis-. 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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