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germ-plasm theory, concept of the physical basis of heredity expressed by the 19th-century biologist August Weismann (q.v.).According to his theory, germ plasm, which is independent from all other cells of the body (somatoplasm), is the essential element of germ cells (eggs and sperm) and is the hereditary material that is passed from generation to generation.
Jan 26, 2015 · The Germ-Plasm compiled Weismann's theoretical work and analyses of other biologists' experimental work in the 1880s, and it provided a framework to study development, evolution and heredity. Weismann anticipated that the germ-plasm theory would enable researchers to investigate the functions and material of hereditary substances.
August Weismann proposed the germ plasm theory in the 19th century, before the foundation of modern genetics. Germ plasm ( German: Keimplasma) is a biological concept developed in the 19th century by the German biologist August Weismann. It states that heritable information is transmitted only by germ cells in the gonads (ovaries and testes ...
May 23, 2014 · Weismann proposed the theory of the continuity of germ-plasm, a theory of heredity. Weismann postulated that germ-plasm was the hereditary material in cells, and parents transmitted to their offspring only the germ-plasm present in germ-cells (sperm and egg cells) rather than somatic or body cells.
Weismann's position towards the mechanism of inheritance and its role for evolution changed during his life. Three periods can be distinguished. German work on cells Weismann's germ plasm theory. The hereditary material, the germ plasm, is transmitted only by the gonads.
Weismann’s achievement was to unite natural history, embryology, and cell biology under the capacious dome of evolutionary theory. In his major work on the germ plasm (1892), which established the material basis of heredity in the “germ cells,” Weismann delivered a crushing blow to Lamarck’s concept of the inheritance of acquired traits.
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