Download or read book Sex Linked Inheritance in Drosophila Classic Reprint written by Thomas Hunt Morgan and published by . This book was released on 2015-07-21 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Sex-Linked Inheritance in Drosophila Although the ratio of 3 to 1 in which contrasted characters reappear in the second or F 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 F 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 F 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."
Download or read book Sex linked Inheritance in Drosophila written by Thomas Hunt Morgan and published by . This book was released on 1916 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sex linked Inheritance in Drosophila written by Thomas Hunt Morgan and published by DigiCat. This book was released on 2022-08-10 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: The following book was written by Thomas Hunt Morgan and Calvin Bridges, and made the former world-famous. It was in the studies covered in the following publication that Morgan discovered that genes are carried on chromosomes and are the mechanical basis of heredity. These discoveries formed the basis of the modern science of genetics; and he would later win the Nobel Prize in Physiology or Medicine in 1933 for his findings.
Download or read book Sex linked Inheritance in Drosophila written by Morgan Thomas Hunt and published by . This book was released on 1901 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sex linked inheritance in Drosophila written by Thomas Hunt Morgan and published by . This book was released on 1916 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Third Chromosome Group of Mutant Characters of Drosophila Melanogaster Classic Reprint written by Calvin Blackman Bridges and published by Forgotten Books. This book was released on 2017-10-29 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Third-Chromosome Group of Mutant Characters of Drosophila Melanogaster Since the work on Dv'osophila began in 1910, about 400 mutants have been found. The sex-linked characters, i. E., those due to genes in the first chromosome, that were known to us in 1914, have been described in our paper, Sex-linked Inheritance in Drosophila (camegie Publication No. 237, The characters whose genes are in the second-chromosome, that were known to us in 1915, have been described in our paper, The Second chromosome Group of Mutant Characters (part II, Carnegie Publication N o. 278, Many other mutant characters in these two groups are now known to us, some of which have been described, but a greater number have been used in experiments dealing with special problems without having been described. It is our intention to publish details concerning these at some future time. The third group is here considered. In table 1, each of the third-chromos-ome mutants treated in this paper is listed in order of discovery, together with its symbol, its locus, and certain facts as to its origin and characteristics. The mutants are dealt with in their chronological order, because each new mutant was first located with reference to the other characters then known. The information required to understand the successive experiments Will, then, have been already furnished in the preceding sections. More accurate deter minations of location in the case of several mutants have been made by using mutants that were discovered later, so that a certain amount of referring forward is unavoidable. 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.
Download or read book Sex Linked Inheritance in Drosophila written by Thomas Hunt Morgan and published by Andesite Press. This book was released on 2015-08-12 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Download or read book Sex Linked Inheritance in Drosophila written by Thomas Hunt Morgan and published by Carveth Press. This book was released on 2009-12 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.
Download or read book SEX LINKED INHERITANCE IN DROS written by Thomas Hunt 1866-1945 Morgan and published by . This book was released on 2016-08-28 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Genetics of Drosophila written by Thomas Hunt Morgan and published by Garland Publishing. This book was released on 1988 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Drosophila Genetics written by Ulrich Graf and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Biological Sciences are in the midst of a scientific rev olution. During the past decade under the rubric of molecu lar biology, chemistry and physics have assumed an integral role in biological research. This is especially true in ge netics, where the cloning of genes and the manipulation of genomic DNA have become in many organisms routine laboratory procedures. These noteworthy advances, it must be empha sized, especially in molecular genetics, are not autonomous. Rather, they have been accomplished with those organisms whose formal genetics has been documented in great detail. For the beginning student or the established investigator who is interested in pursuing eukaryote molecular genetic re search, Drosophila melanogaster, with its rich body of formal genetic information is one organism of choice. The book "Drosophila Genetics. A Practical Course" is an indispens able source of information for the beginner in the biology and formal genetics of Drosophila melanogaster. The scope of this guide, a revision and enlargement of the original German language version, is broad and instructive. The information included ranges from the simple, but necessary, details on how to culture and manipulate Drosophila flies to a series of more sophisticated genetic experiments. After completing the experiments detailed in the text, all students - neophyte or experienced - will be richly rewarded by having acquired a broad base of classical genetics information relevant for the biologist in its own right and prerequisite to Drosophila genetics research - formal and/or molecular. Davis, California, Melvin M.
Download or read book Concepts of Biology written by Samantha Fowler and published by . This book was released on 2018-01-07 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concepts of Biology is designed for the single-semester introduction to biology course for non-science majors, which for many students is their only college-level science course. As such, this course represents an important opportunity for students to develop the necessary knowledge, tools, and skills to make informed decisions as they continue with their lives. Rather than being mired down with facts and vocabulary, the typical non-science major student needs information presented in a way that is easy to read and understand. Even more importantly, the content should be meaningful. Students do much better when they understand why biology is relevant to their everyday lives. For these reasons, Concepts of Biology is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand.We also strive to show the interconnectedness of topics within this extremely broad discipline. In order to meet the needs of today's instructors and students, we maintain the overall organization and coverage found in most syllabi for this course. A strength of Concepts of Biology is that instructors can customize the book, adapting it to the approach that works best in their classroom. Concepts of Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand--and apply--key concepts.
Download or read book Experiments in Plant Hybridisation written by Gregor Mendel and published by Cosimo, Inc.. This book was released on 2008-11-01 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments which in previous years were made with ornamental plants have already afforded evidence that the hybrids, as a rule, are not exactly intermediate between the parental species. With some of the more striking characters, those, for instance, which relate to the form and size of the leaves, the pubescence of the several parts, etc., the intermediate, indeed, is nearly always to be seen; in other cases, however, one of the two parental characters is so preponderant that it is difficult, or quite impossible, to detect the other in the hybrid. from 4. The Forms of the Hybrid One of the most influential and important scientific works ever written, the 1865 paper Experiments in Plant Hybridisation was all but ignored in its day, and its author, Austrian priest and scientist GREGOR JOHANN MENDEL (18221884), died before seeing the dramatic long-term impact of his work, which was rediscovered at the turn of the 20th century and is now considered foundational to modern genetics. A simple, eloquent description of his 18561863 study of the inheritance of traits in pea plantsMendel analyzed 29,000 of themthis is essential reading for biology students and readers of science history. Cosimo presents this compact edition from the 1909 translation by British geneticist WILLIAM BATESON (18611926).
Download or read book The Mechanism of Mendelian Heredity written by Thomas Hunt Morgan and published by . This book was released on 1923 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetics of Speciation written by David L. Jameson and published by . This book was released on 1977 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nature of populations, races, subspecies, and species. Genetic basis of isolation. Origin of isolation - theoretical. Origin of isolation - experimental. The nature of the speciation process.
Download or read book Drosophila Neurobiology written by Bing Zhang and published by . This book was released on 2010 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on Cold Spring Harbor Laboratory's long-running course, Drosophila Neurobiology: A Laboratory Manual offers detailed protocols and background material for researchers interested in using Drosophila as an experimental model for investigating the nervous system. This manual covers three approaches to the field: analysis of neural development, recording and imaging activities in the nervous system, and analysis of behavior. Techniques described include molecular, genetic, electrophysiological, imaging, behavioral and developmental methods.
Download or read book Fly Pushing written by Ralph J. Greenspan and published by CSHL Press. This book was released on 2004 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: A second edition of the classic handbook has become a standard in the Drosophila field. This edition is expanded to include topics in which classical genetic strategies have been augmented with new molecular tools. Included are such new techniques as homologous recombination, RNAi, new mapping techniques, and new mosaic marking techniques.
