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On Germinal Selection as a Source of Definite Variation

By August Weismann
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About This Book

The essay proposes that selection among germinal elements within organisms directs hereditary variation, serving as a necessary complement to external natural selection. Drawing on a mechanistic model of heredity, it develops the concepts of determinants and constituent units (biophores) to explain how internal differential activity can bias variation in adaptive directions without invoking teleology. The author defends theoretical modeling by analogy to physical constructs, addresses criticisms of his heredity theory, and argues that germinal-level processes make definite, condition-responsive variation conceivable. The text includes a lecture-form exposition and an appendix that expands technical points and responds to objections.

About the Author

Weismann, August portrait

August Weismann

August Weismann was a prominent German biologist known for his foundational contributions to the field of evolutionary theory. He is best recognized for his work on heredity and the concept of germinal selection, which he articulated in his influential book "On Germinal Selection as a Source of Definite Variation." Weismann's theories challenged prevailing notions of inheritance and laid the groundwork for modern genetics. His two-volume work, "Studies in the Theory of Descent," further explored the mechanisms of evolution and the role of natural selection. Through his extensive research and writings, Weismann significantly shaped the understanding of biological evolution and heredity.

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