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Author: Edward Murray East
Publisher:
ISBN:
Category : Heterozygosis
Languages : en
Pages : 82
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Book Description
Author: Edward Murray East
Publisher:
ISBN:
Category : Heterozygosis
Languages : en
Pages : 82
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Book Description
Author: Edward Murray East
Publisher: Forgotten Books
ISBN: 9780265824818
Category : Science
Languages : en
Pages : 70
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Book Description
Excerpt from Heterozygosis in Evolution and in Plant Breeding When a biologist begins any line of genetic work with either plants or animals he generally has occasion to differentiate his stock into. More or less pure types by in-and-in breeding. Frequently In the case of animals, and nearly always ln the case of plants that are naturally cross-fertilized, he finds there is a loss of vigor, usually unaccompanied by pathological symptoms. This loss of vigor is generally expressed by a decrease In the size of the individual, but it may be shown by a slight decrease in fertility. The phenomenon, although it probably occurs in all great groups reproducing sexually, is not general, however, for in many animals and in plants that are normally self-fertilized it is unnoticeable. If after obtaining his pure stocks the experimenter has occasion to cross strains that differ in character, he Often finds that the reverse phenomenon occurs. The vigor of the hybrid is greater than that of either parent. These manifestations have been noticed for over a century by plant breeders and for probably two thousand years or more by animal hybridizers. Until the end of the nineteenth century\ the interpretation of the phenomena, if, indeed, that which is Only a paraphrased statement of the facts can be called an interpreta tion, was that deterioration both morphological and physiological is the direct result Of inbreeding, and therefore occasional crossing of genetically distinct blood lines is a necessary requisite to vigor in every sexually propagated species. Seven years ago an extended series Of investigations was started at the Connecticut Agricultural Experiment Station having as their primary object an interpretation of these facts in keeping with the more extended knowledge comprised in modern biology. This paper presents a full account Of the views that the writers have come to hold through the data gathered in these experiments, although it has not been thought necessary or advisable to confuse the arguments by overloading it with all of the data in their posses. 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.
Author: Edward Murray East
Publisher:
ISBN:
Category :
Languages : en
Pages : 58
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Book Description
Author: Edward Murray EAST
Publisher:
ISBN:
Category :
Languages : en
Pages : 58
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Book Description
Author: Edward M. (Edward Murray) 1879-19 East
Publisher:
ISBN: 9781362977063
Category : History
Languages : en
Pages : 66
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Book Description
Author: Darbeshwar Roy
Publisher: Alpha Science Int'l Ltd.
ISBN: 9781842650066
Category : Nature
Languages : en
Pages : 734
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Book Description
This book describes the experimental and analytical methodologies available for the genetical analysis of qualitative, quasi-quantitative and quantitative traits and its applications in practical plant breeding and evolution. Models for studying quantitative genetic variation following Birmingham and Edinburgh notations are described. The statistics used is simple and systematic so that the reader will have no difficulty in solving problems in plant genetics. It describes the genetic principles and provides breeding procedures underlying various breeding methods for manipulating qualitative, quasi-quantitative and quantitative traits. It takes into account the latest developments in breeding methodologies including dihaiploidy and apomixis, applications of tissue culture for plant breeding use, genetic engineering for production of transgenics and hybrids, and molecular marker technologies in the analysis of quantitative trait loci, marker assisted selection, evolution and conservation of genetic resources. This book will be useful for undergraduates, postgraduates, teachers and researchers working in the field of genetics and plant breeding.
Author: Donald A. Levin
Publisher: Oxford University Press
ISBN: 019535012X
Category : Science
Languages : en
Pages : 241
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Book Description
The application of new molecular technology has greatly increased our understanding of the role of chromosomal change in plant evolution. There is now a broad database on genome size variation within and among species and a wide array of nuclear and cytoplasmic genetic markers. There is a variety of literatures addressing this subject but much of it is scattered. This book created a contemporary synthesis or work in this area and addresses issues such as herogeneity, polyploidy, chromosomal rearrangements within species and phenotypic consequences of chromosome doubling.
Author: Fred N. Briggs
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 456
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Book Description
Perspectives in plant breeding. The evolution of cultivated plants. Plant introductions. Mode of reproduction in relation to plant-breeding methods. Variability in plants. Genes and qualitative characters. Genes and qualitative characters. Quantitative inheritance. Role of the environment in plant breeding. Selection in self-pollinated crops. Hybridization and gene combinations. Breeding self-pollinated crops by hybridization and pedigree selection. Bulk population method of breeding self-pollinated plants. The backcross method of breeding. Cross-pollinated crops. Control of cross-pollination. Selection in cross-pollinated crops. Inbreeding and heterosis. Hybrid varieties. Recurrent selection. Synthetic varieties. Autoploidy in plant breeding. Alloploidy.Aneuploids. Mutagens and crop improvement. Interspecific hybridization. Interspecific transfer of characters. Genetics of resistance to diseases and insects. Breeding for resistance to diseases and insects. Maintenance and distribution of varieties. Field-plot technique and experimental design.
Author: James F. Hancock
Publisher:
ISBN:
Category : Crops
Languages : en
Pages : 328
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Book Description
Author: A. H. D. Brown
Publisher: Sinauer Associates, Incorporated
ISBN:
Category : Science
Languages : en
Pages : 470
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Book Description
From the International Symposium on Population Genetics and Germplasm Resources in Crop Improvement, held August 1988 at U. Cal., Davis. Twenty-one contributions are grouped into three broad sections which consider the kinds and amounts of genetic diversity found in plant species at the protein and DNA levels; the structure of genetic variation and the evolutionary processes that shape genetic diversity; and applications in forestry, crop improvement, and the conservation and use of crop genetic resources. Cloth edition (unseen), $60. Annotation copyrighted by Book News, Inc., Portland, OR
