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- W1641815039 abstract "The germplasm theory of Weismann substitutes a simple and rational conception for this complicated and inverted view of development, heredity and evolution. According to Weismann the intrinsic causes of development are in the germplasm and not in the soma of the developed organism; the germplasm is continuous from generation to generation and is not made anew in each generation by the soma; the germplasm is relatively stable as compared with the somatoplasm, so that while the latter undergoes many changes in response to environmental stimuli, the former undergoes few. Heredity is the transmission of parental germplasms to offspring, usually through the male and female sex cells; ontogeny is the conversion of portions of the protoplasm into the differentiated tissues of the developed organism, while other portions remain unchanged, especially in the sex cells; evolution consists primarily in the transmutation of one type of germplasm into another, not of one type of developed organism into another. Thus at one stroke the germplasm theory, if accepted, eliminates most of the older theories of evolution and substitutes in the place of mysterious and even mystical causes relatively simple and mechanical ones. Shortly after the publication in 1892 of Weismann's book on the Germplasm there was a general outcry against the highly speculative character of this theory. It was said that whereas genuine progress in science depends, upon the control of the scientific imagination by the brake of observation and experiment, Weismann had allowed his imagination to run wild without any brake at all. One critic (Ryder) said that there" @default.
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- W1641815039 date "1920-03-01" @default.
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- W1641815039 title "The Mechanism of Evolution. In the Light of Heredity and Development" @default.
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