Author
Anthony H. D. Brown
Bio: Anthony H. D. Brown is an academic researcher from Commonwealth Scientific and Industrial Research Organisation. The author has contributed to research in topics: Population & Germplasm. The author has an hindex of 49, co-authored 150 publications receiving 10506 citations.
Topics: Population, Germplasm, Genetic diversity, Hordeum vulgare, Mating system
Papers published on a yearly basis
Papers
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Book•
01 Oct 1989
TL;DR: A resource for students and research workers in population genetics, molecular evolution, evolutionary biology, ecological genetics, forestry and crop improvement.
Abstract: A resource for students and research workers in population genetics, molecular evolution, evolutionary biology, ecological genetics, forestry and crop improvement
967 citations
TL;DR: Large numbers of entries are now lodged in many of the world's germ-plasm collections of crop and pasture plants, and the problems of how best to conserve it and how to use it in plant breeding have intensified.
Abstract: Large numbers of entries are now lodged in many of the world's germ-plasm collections of crop and pasture plants This abundance of material, assembled to guard against its irretrievable loss, has
705 citations
TL;DR: Evidence indicates that inbreeding plant species show more intense geographic and microgeographic differentiation, and more intense multilocus associations than outbreeders, and a closer integration of the joint microevolution of mating systems, and of genetic variation is required.
606 citations
TL;DR: The association of alleles among different loci was studied in natural populations of Hordeum spontaneum, the evolutionary progenitor of cultivated barley, and the variance of the number of heterozygous loci in two randomly chosen gametes affords a useful measure of such association.
Abstract: The association of alleles among different loci was studied in natural populations of Hordeum spontaneum, the evolutionary progenitor of cultivated barley. The variance of the number of heterozygous loci in two randomly chosen gametes affords a useful measure of such association. The behavior of this statistic in several particular models is described. Generally, linkage (gametic phase) disequilibrium tends to increase the variance above the value expected under complete independence. This increase is greatest when disequilibria are such as to maximize the sum of squares of the two-locus gametic frequencies.-When data on several loci per individual are available, the observed variance may be tested for its agreement with that expected under the hypothesis of complete interlocus independence, using the sampling theory of this model. When applied to allozyme data from 26 polymorphic populations of wild barley, this test demonstrated the presence of geographically widespread multilocus organization. On average, the variance was 80% higher than expected under random association. Gametic frequencies for four esterase loci in both of these populations of wild barley and two composite crosses of cultivated barley were analyzed. Most generations of the composites showed less multilocus structure, as measured by the indices of association, than the wild populations.
579 citations
Book•
01 Sep 1995
TL;DR: The biological system of conservation is described in this article, where the conservation in situ of useful or endangered wild species and in situ conservation of threatened and endangered plants are discussed. And the conservation of cultivated plants is discussed.
Abstract: Preface Part I. Introduction: 1. The biological system of conservation Part II. Diversity and Conservation of Plant Genes: 2. The genetic diversity of wild plants 3. The genetic diversity of cultivated plants 4. The conservation of cultivated plants Part III. Conservation of Plant Species: 5. Plant species conservation and population biology 6. The conservation in situ of useful or endangered wild species 7. Ex situ conservation of threatened and endangered plants Part IV. Conservation of Plant Communities: 8. Community structure and species interactions 9. Choosing plant community reserves 10. Managing plant community reserves 11. Conclusions References Index.
534 citations
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TL;DR: Preface to the Princeton Landmarks in Biology Edition vii Preface xi Symbols used xiii 1.
Abstract: Preface to the Princeton Landmarks in Biology Edition vii Preface xi Symbols Used xiii 1. The Importance of Islands 3 2. Area and Number of Speicies 8 3. Further Explanations of the Area-Diversity Pattern 19 4. The Strategy of Colonization 68 5. Invasibility and the Variable Niche 94 6. Stepping Stones and Biotic Exchange 123 7. Evolutionary Changes Following Colonization 145 8. Prospect 181 Glossary 185 References 193 Index 201
14,171 citations
Journal Article•
TL;DR: It is suggested that the natural selection against large insertion/deletion is so weak that a large amount of variation is maintained in a population.
11,521 citations
TL;DR: It is concluded that multiple Imputation for Nonresponse in Surveys should be considered as a legitimate method for answering the question of why people do not respond to survey questions.
Abstract: 25. Multiple Imputation for Nonresponse in Surveys. By D. B. Rubin. ISBN 0 471 08705 X. Wiley, Chichester, 1987. 258 pp. £30.25.
3,216 citations
TL;DR: The evidence that the evolution of breeding systems of animals and plants has been significantly influenced by the occurrence of inbreeding depression is reviewed, and the contemporary genetic theory of inmarriage depression and heterosis and the experimental data concerning the strength of in breeding depression are considered.
Abstract: The harmful effects of close inbreeding have been noticed for many centuries (34, 35, 165). With the rise of Mendelian genetics, it was realized that the main genetic consequence of inbreeding is homozygosis (165, Ch. 2). Two main theories were early proposed to account for inbreeding depression and its converse, heterosis (the increase in vigor observed in an F1 between two inbred lines). These are the overdominance and partial dominance hypotheses, discussed in more detail below. Research into this question has continued up to the present, and this is one of the topics that we discuss. Darwin (35, 36) was the first to point out that the evident adaptations of many plants for ensuring outcrossing could be understood in terms of the selective advantage of avoiding inbreeding depression. We review the evidence that the evolution of breeding systems of animals and plants has been significantly influenced by the occurrence of inbreeding depression. In order to do this, we consider the contemporary genetic theory of inbreeding depression and heterosis, and the experimental data concerning the strength of inbreeding depression. We emphasize data and theory relevant to natural, rather than domesticated, populations as we are chiefly concerned to evaluate the evolutionary significance of inbreeding depression. We do not attempt to give a complete bibliography of this very extensive field but try to concentrate on what seem to be the most significant findings in relation to this aim.
3,135 citations
TL;DR: The small-population paradigm has not yet contributed significantly to conserving endangered species in the wild because it treats an erect (smallness) as if it were a cause and hence is of scant theoretical interest.
Abstract: Conservation biology has two threads: the small-population paradigm which deals with the erect of smallness on the persistence of a population, and the declining-population paradigm which deals with the cause of smallness and its cure. The processes relevant to the small-population paradigm are amenable to theoretical examination because they generalize across species and are subsumed by an inclusive higher category: stochasticity. In contrast, the processes relevant to the declining-population paradigm are essentially humdrum, being not one but many. So far they have defied tight generalization and hence are of scant theoretical interest. The small-population paradigm has not yet contributed significantly to conserving endangered species in the wild because it treats an erect (smallness) as if it were a cause
2,110 citations