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August Weismann’s 1892 theory that inheritance is transmitted through eggs and sperm provided the biological mechanism for natural selection. In this full-lengt... Front Matter
Oct 26, 2020 · Continued……. The Great Mutilation Experiment: In 1891, a scientist by the name of August Friedrich Weismann conducted an interesting experiment with mice. He was trying to prove a theory called “Lamarckism” which still teaches “inheritance of acquired characteristics.” The theory declares that birds living in the water grow webbed ...
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Sep 2, 2008 · Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb. xxiii, 477 pages 19 cm Includes index Part I. The material basis of heredity -- 1. The germ-plasm -- Part II. Heredity in its relation to monogonic reproduction -- 2. Regeneration -- 3. Multiplication by fission -- 4.
The hereditary material, the germ plasm, is transmitted only by the gonads. Somatic cells (of the body) develop afresh in each generation from the germ plasm. August Weismann proposed the germ plasm theory in the 19th century, before the foundation of modern genetics.
August Weismann is famous for having argued against the inheritance of acquired characters. However, an analysis of his work indicates that Weismann always held that changes in external conditions, acting during development, were the necessary causes of variation in the hereditary material.
The first one who went beyond Darwin's concept in the matter of a theory of inheritance, with particular attention to cellular processes, was Weismann. He connected evolutionary notions, the theory of selection of Darwin, with the most recent knowledge of cytology, embryology, and genetics.
- Ralf-Dietmar Hegel
- 1991
Abstract. August Weismann is famous for having argued against the inheritance of acquired characters. However, an analysis of his work indicates that Weismann always held that changes in external conditions, acting during development, were the necessary causes of variation in the hereditary material.
