On Germinal Selection As a Source of Definite Variation - Couverture souple

Weismann, August

Couverture souple

ISBN 10 : 1437036724 ISBN 13 : 9781437036725

Editeur : Kessinger Publishing, 2008

Synopsis

""On Germinal Selection As A Source Of Definite Variation"" is a scientific book written by August Weismann and published in 1896. The book explores the concept of germinal selection, which is the idea that variations in an organism's traits arise from the selection of specific germ cells during reproduction. Weismann argues that this process is responsible for creating definite variations in species, as opposed to the random variations that occur through natural selection.The book is divided into three parts. The first part provides an overview of the theory of evolution and the role of natural selection in shaping species. The second part delves into the concept of germinal selection and how it operates in the development of new traits. Weismann describes the process of germinal selection in detail, including the factors that influence the selection of germ cells and the mechanisms by which new traits are created.In the third part of the book, Weismann discusses the implications of germinal selection for the study of evolution and genetics. He argues that germinal selection provides a more accurate explanation for the development of new traits than other theories, such as Lamarckism. He also explores the potential applications of germinal selection in breeding and the development of new species.Overall, ""On Germinal Selection As A Source Of Definite Variation"" is a seminal work in the field of evolutionary biology. Weismann's theory of germinal selection has had a significant impact on the study of genetics and evolution, and the book remains an important reference for scientists and researchers in these fields.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.

A propos du livre

Présentation de l'éditeur

From the PREFACE.
The present paper was read in the first general meeting of the International Congress of Zoologists at Leyden on September 16, 1895. Several points, which for reasons of brevity were omitted when the paper was read, have been re-embodied in the text, and an Appendix has been added where a number of topics receive fuller treatment than could well be accorded to them in a lecture. The address was first printed in The Monist for January, 1896, and afterwards in a German pamphlet.
The basal idea of the essay — the existence of Germinal Selection—was propounded by me some time since, 1 but it is here for the first time fully set forth and tentatively shown to be the necessary complement of the process of selection. Knowing this factor, we remove, it seems to me, the patent contradiction of the assumption that the general fitness of organisms, or the adaptations necessary to their existence, are produced by accidental variations — a contradiction which formed a serious stumbling-block to the theory of selection. Though still assuming that the primary variations are "accidental," I yet hope to have demonstrated that an interior, mechanism exists which compels them to go on increasing in a definite direction, the moment selection intervenes. Definitely directed variation exists, but not predestined variation, running on independently of the life-conditions of the organism, as Naegeli, to mention the most extreme advocate of this doctrine, has assumed; on the contrary, the variation is such as is elicited and controlled by those conditions themselves, though indirectly.
In basing my proof of the doctrine of Germinal Selection on the fundamental conceptions of my theory of heredity, a few words of justification are necessary, owing to the fact that the last-mentioned theory has been widely and severely assailed since its first emergence into light and even repudiated as absolutely futile and erroneous.

Présentation de l'éditeur

Leopold Classic Library is delighted to publish this classic book as part of our extensive collection. As part of our on-going commitment to delivering value to the reader, we have also provided you with a link to a website, where you may download a digital version of this work for free. Many of the books in our collection have been out of print for decades, and therefore have not been accessible to the general public. Whilst the books in this collection have not been hand curated, an aim of our publishing program is to facilitate rapid access to this vast reservoir of literature. As a result of this book being first published many decades ago, it may have occasional imperfections. These imperfections may include poor picture quality, blurred or missing text. While some of these imperfections may have appeared in the original work, others may have resulted from the scanning process that has been applied. However, our view is that this is a significant literary work, which deserves to be brought back into print after many decades. While some publishers have applied optical character recognition (OCR), this approach has its own drawbacks, which include formatting errors, misspelt words, or the presence of inappropriate characters. Our philosophy has been guided by a desire to provide the reader with an experience that is as close as possible to ownership of the original work. We hope that you will enjoy this wonderful classic book, and that the occasional imperfection that it might contain will not detract from the experience.

Détails de l'édition

• Éditeur: Kessinger Publishing
• Date d'édition: 2008
• Langue: anglais
• ISBN 10: 1437036724
• ISBN 13: 9781437036725
• Reliure: Broché
• Nombre de pages: 96
• Coordonnées du fabricant: non disponible
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