Sinopsis
Excerpt from Sex-Linked Inheritance in Drosophila
Furrowed Additional data for yellow, white, vermilion, and miniature.
New data contributed by A. H. Sturtevant and H. J. Muller Summary of the previously determined cross-over values Summary Of all data upon linkage of gens in chromosome I.
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Excerpt from Sex-Linked Inheritance in Drosophila
Furrowed Additional data for yellow, white, vermilion, and miniature.
New data contributed by A. H. Sturtevant and H. J. Muller Summary of the previously determined cross-over values Summary Of all data upon linkage of gens in chromosome I.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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Excerpt from Sex-Linked Inheritance in Drosophila
Although the ratio of 3 to 1 in which contrasted characters reappear in the second or F₂ generation is sometimes referred to as Mendel's Law of Heredity, the really significant discovery of Mendel was not the 3 to 1 ratio, but the segregation of the characters (or rather, of the germinal representatives of the characters) which is the underlying cause of the appearance of the ratio. Mendel saw that the characters with which he worked must be represented in the germ-cells by specific producers (which we may call factors), and that in the fertilization of an individual showing one member of a pair of contrasting characters by an individual showing the other member, the factors for the two characters meet in the hybrid, and that taken the hybrid forms germ-cells the factors segregate from each other without having been contaminated one by the other. In consequence, half the germ-cells contain one member of the pair and the other half the other member. When two such hybrid individuals are bred together the combinations of the pure germ-cells give three classes of offspring, namely, two hybrids to one of each of the pure forms. Since the hybrids usually can not be distinguished from one of the pure forms, the observed ratio is 3 of one kind (the dominant) to 1 of the other kind (the recessive).
There is another discovery that is generally included as a part of Mendel's Law. We may refer to this as the assortment in the germ-cells of the products of the segregation of two or more pairs of factors. If assortment takes place according to chance, then definite F₂ ratios result, such as 9:3:3:1 (for two pairs) and 27:9:9:9:3:3:3:1 (for three pairs), etc. Mendel obtained such ratios in peas, and until quite recently it has been generally supposed that free assortment is the rule when several pairs of characters are involved. But, as we shall try to show, the emphasis that has been laid on these ratios has obscured the really important part of Mendel's discovery, namely, segregation; for with the discovery in 1906 of the fact of linkage the ratios based on free assortment were seen to hold only for combinations of certain pairs of characters, not for other combinations. But the principle of segregation still holds for each pair of characters. Hence segregation remains the cardinal point of Mendelism. Segregation is to-day Mendel's Law.
Linkage and Chromosomes.
It has been found that when certain characters enter a cross together (i.e., from the same parent) their factors tend to pass into the same gamete of the hybrid, with the result that other ratios, than the chance ratios described by Mendel are found in the F₂ generation.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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Sex-Linked Inheritance in Drosophila (Classic Reprint)
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Paperback. Condición: New. Print on Demand. This book makes the case for understanding Gregor Mendel's discovery of genetic principles as a paradigm shift in the understanding of life. The author substantiates how Mendel's groundbreaking work on pea plants in the 1860s provided foundational insights that would eventually shape the field of modern genetics. This book is essential reading not only for biologists, but for anyone who wants to grapple with the history and legacy of scientific inquiry. The author provides a detailed overview of genetics before Mendel, highlighting the importance of Mendel's contemporaries and predecessors like Darwin. This book also unpacks the significance of concepts like chromosomes, linkage, and mutation in Mendelian genetics, all leading to a better grasp of the significance and impact of this scientific revolution. 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. Nº de ref. del artículo: 9781331958178_0
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Condición: New. KlappentextrnrnExcerpt from Sex-Linked Inheritance in DrosophilaFurrowed Additional data for yellow, white, vermilion, and miniature.New data contributed by A. H. Sturtevant and H. J. Muller Summary of the previously determined c. Nº de ref. del artículo: 2147910382
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