Articles liés à Heredity (Classic Reprint)
Synopsis
Excerpt from Heredity
Amongst many other problems of heredity, Professor Pearson and his pupils have investigated the inheritance of stature in man. They proceeded by measuring, in a great many instances, the height of a father and one or more of his sons. The average height of all the men measured was about five feet eight inches. It was found that if one considered by itself the group of fathers measuring about six feet, the average height of their sons was about five feet ten. Further, if one took by itself the group of fathers measuring five feet six, the average height of their sons was about five feet seven. That is, tall or short fathers tended to have tall or short sons respectively, but the resemblance as regards stature was only partial. In other words, variations in stature were inherited, but only to a limited extent.
Professor Johannsen of Copenhagen has carried out an investigation on similar lines with regard to the size of the seed in beans. Taking the seeds from a single plant, he separated the large from the small, and planted each lot separately. From the resulting plants, when ripe, he took the seeds and weighed them; he found no difference in the average size of the seed in the two lots. He repeated this experiment several times, and kept on selecting for several generations, but always with the same result. Variations in the size of seed, within a single race, were not inherited at all.
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Heredity (Classic Reprint)
impression à la demandeVendeur : Forgotten Books, London, Royaume-Uni
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Paperback. Etat : New. Print on Demand. This book delves into the fascinating world of heredity, exploring the fundamental question of why offspring resemble their parents. The author takes readers on a journey through the history of scientific inquiry into this topic, from the ancient theories of Hippocrates to the groundbreaking work of Darwin and Weismann. The text examines the mechanisms of sexual reproduction, comparing the sperm and egg cells, and dissecting the intricate process of fertilization and development. It introduces the concept of variation, discussing the statistical methods used to measure and analyze the differences between individuals within a species. The author explores the various types of variation, including inborn variations and acquired characters, and delves into the nature and causes of these differences. Key ideas presented in the book include the theory of germinal continuity, which posits that the germ cells are the direct descendants of the previous generation and are not influenced by acquired characters. The text also discusses the debate surrounding the inheritance of acquired characters, examining the arguments for and against the idea that traits acquired during an organism's lifetime can be passed down to its offspring. The book concludes by highlighting the importance of understanding heredity for improving both the breeds of economic plants and animals, as well as for gaining insights into the inborn characters of humanity itself. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. N° de réf. du vendeur 9781440084089_0
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Heredity Classic Reprint
Vendeur : PBShop.store US, Wood Dale, IL, Etats-Unis
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PAP. Etat : New. New Book. Shipped from UK. Established seller since 2000. N° de réf. du vendeur LW-9781440084089
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Heredity Classic Reprint
Vendeur : PBShop.store UK, Fairford, GLOS, Royaume-Uni
Évaluation du vendeur 5 sur 5 étoiles
PAP. Etat : New. New Book. Shipped from UK. Established seller since 2000. N° de réf. du vendeur LW-9781440084089
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EUR 25,28
Expédition à EUR 3,84
Expédition depuis Royaume-Uni vers Etats-Unis
Expédition depuis Royaume-Uni vers Etats-Unis
Quantité disponible : 15 disponible(s)