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- Weismann conceived of the emergence of multicellular organisms as analogous to the formation of a colony of single‐celled organisms, with a division of labor among cells specialized for different functions: most importantly, the germ cells retained the potential immortality of their single‐celled ancestors (which had reproduced by simple division) while the cells of the rest of the body (the soma) became simply the evolutionary host and vehicle by which these germ cells were transmitted from one...
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Jan 26, 2015 · In part one of The Germ-Plasm, "The Material Basis of Heredity," Weismann describes the constitution and structure of the germ-plasm. Weismann postulates that there are four hierarchical levels of substances in the cell, and he coins four terms to name them.
Apr 15, 2024 · August Weismann was a German biologist and one of the founders of the science of genetics. He is best known for his opposition to the doctrine of the inheritance of acquired traits and for his “germ plasm” theory, the forerunner of DNA theory.
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.
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.
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August Weismann. August Friedrich Leopold Weismann FRS (For), HonFRSE, LLD (17 January 1834 – 5 November 1914) was a German evolutionary biologist. Fellow German Ernst Mayr ranked him as the second most notable evolutionary theorist of the 19th century, after Charles Darwin. Weismann became the Director of the Zoological Institute and the ...
May 1, 2006 · Abstract. This chapter focuses on August Weismann's theory of the germ-plasm. It is argued that both Weismann's failure to conceive of any alternative to the disintegration of the idioplasm as the mechanism of ontogenetic differentiation and nuclear control, and his failure to conceive of any genuinely facultative capacity on the part of the germ-plasm suggest that Weismann never conceived of ...
Jun 11, 2018 · WEISMANN, AUGUST FRIEDRICH LEOPOLD. ( b. Frankfurt am Main, Germany, 17 January 1834; d. Freiburg im Breisgau, Germany, 5 November 1914), zoology. Weismann’s most influential contribution to biological thought was his theory of the continuity of the germ plasm, an explanation of heredity and development. He maintained that the germ plasm, the ...
