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By Harry Fawcett Buckley

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The postulate of genetics was that the nuclear gene system was largely immune from environmental influences. Genes themselve remained constant, in whatever place and at whatever time within the life history of the individual. As Morgan (1919, p. " As long as this remained a necessary part of the gene theory, genes lay beyond the essential problem of development. Differentiation in relation to space and time—the order and control of hereditary potentialities—had to be an environmental relationship mediated through the cytoplasm.

Jost in 1907, "that the mode of arrangement of the ultimate parts of the organism is of greater importance than the chemical nature of these parts" (see Wilson, 1925, p. 670). Consistent with this belief, J. G. Hopkins, founder of biochemistry at Cambridge and mentor of Joseph Needham, who would later develop what he called "chemical embryology," stressed the need to appreciate the structural geography of the cell. "It is clear," Hopkins wrote in 1913, "that the living cell as we know it, is not a mass of matter composed of living molecules, but a highly differentiated system" (Wilson, 1925, p.

They considered them to be a mechanism of cytoplasmic heredity comparable in importance with chromosomes. They were believed to be fundamentally important for the chemical activities of the cell and for the processes of tissue development and differentiation, forming the source from which arise many of the more specific cell components, including plastids. By the 1920s, following the morphogenetic and cytological investigations of the cytoplasm and his own cytological studies of mitochondria, E.

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A short history of physics, by Harry Fawcett Buckley

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