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    <subfield code="b">Biblioteca Nacional de London.</subfield>
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    <subfield code="a">Biblioteca Central de la Universidad Nacional Agraria de la Selva</subfield>
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    <subfield code="a">Modern Genetics /</subfield>
    <subfield code="b">Volume 3 /</subfield>
    <subfield code="c">J. A. Sierra.</subfield>
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    <subfield code="a">III FIFTH AVENUE</subfield>
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    <subfield code="a">London : </subfield>
    <subfield code="b">By Academic Press Inc. (London) Ltd.</subfield>
    <subfield code="c">1968</subfield>
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    <subfield code="a">volumen 3</subfield>
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    <subfield code="a">Contents.</subfield>
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  <datafield tag="500" ind1=" " ind2=" ">
    <subfield code="a">Author Index.</subfield>
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  <datafield tag="500" ind1=" " ind2=" ">
    <subfield code="a">Subject Index.</subfield>
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  <datafield tag="504" ind1=" " ind2=" ">
    <subfield code="a">References.</subfield>
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  <datafield tag="505" ind1=" " ind2=" ">
    <subfield code="a">                                              CONTENTS : 
                            PART VII : Cytoplasmic Inheritance and Cytoplasmic Changes.
          Chapter 19 : 
          Inheritance Though the Cytoplasm and its Inclusions. Chimeras and Interspecific Hybrids. Cytoplasmic Treptions and Mutations.
                         19.1 Predetermination, Maternal and Clonal Transmission.
                         19.2 Transmission Through Particulate Constituents in the Cytoplasm.
                         19.3 Chimeras and Vegetative Hybrids.
                         19.4 Cytoplasmic Differences and Interspecific Hybrids.
                         19.5 Cytoplasmic Variants and the Nature of Cytoplasmic Determinants.
                           
                         PART VIII : Nuclear Treptions and Mutations. Genetic Units.
        Chapter 20 : Numerical Treptions and Mutations. Polyploidy and Heteroploidy.
                      20.1 Detection and Types of Numerical Treptions and Mutations.
                      20.2 Detection and Types  of Numerical Treptions and Mutations.
                      20.3 Trptional and Mutational Heteroploidy.
                      20.4 The Role and Origin of Numerical Variants.
         Chaptr  21 :  Structural mTreptions and Mutations. Chromosomal Breakage. Deletions, Duplications, Inversions  and Trans locations.
                      21.1 Origin of Chromosome Breakage and Rearrangements.
                      21.2 Deficiences and their Effects.
                      21.3 Duplications and their Effects.
                      21.4 Inversions and their  Effects.
                      21.5 Translocations and their Effects.
        Chapter 22 :  Position Effects, Genic Treptions and Mutations. Genetic Units and "CODING".
                      22.1 Position Effects and Variegation.
                      22.2 Genetic Treptions.
                      22.3 Gene Mutations.
                      22.4 Genetic Units, and the Organization and Replication of the Genetic Material.
                      22.5 Genetic "Coding" in Relation to Protein Synthesis Elementary and Subgenetic  Changes.
                      
                      PART IX : Sex Determination and Life Cycles.
         Chapter 23 : Genetics of Sex Determination in Relation to Life Cycles.
                       23.1 Roles and Types of Sexual Reproduction.
                       23.2 Types of Sex  Determination.
                       23.3 Genotypic Eusexual Determination (Vertebrates Excepted).
                       23.4 Sex Determination in Vertebrates. General Interpretation of Genotypic Sex Determination.
                       23.5 Enviromental Eusexual Switch.over.
                       23.6 Mating Type Determination.
                       23.7 Sexual Phenomena Expressed in Chromosome Behaviour.</subfield>
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    <subfield code="a">                                                                       PREFACE :
          This is a completely revised rewritten edition of a book first published in Portuguese about fourteen years ago.In preparing the present edition the author  has endeavoured to bring the text up to date with a thorough review of the literature . In so vast a field as genetics, which now embraces biochemistry, microbiology, immunology - as well as cytology and statistic - it is difficult to keep abreast of the enormous  autput of literature on genetics now appearing. Ibelieve, however, thart I have done justice to such work as was accesible  and apologize in advance for the inevitable omissions and possible errors. In bibliographical citations, preference has been given to contemporary work rather than to the historical aspect.
       The book in its Portuguese version has been succssfully used as an advanced genetics text. It is my hope that this new edition may be equally useful to a grater audience of English - speaking readers. It would, of course, have been incomparably easier to write a more specialized or concise book, but it would be difficlt to justify yet another short text on genetics. A selection of some of the more useful sections from these tree volumes provides an introductory text to the subject; the Portuguese version has often been employed for this purpose . As genetics literature is becoming one of the major biological sciences, a detailed text where the reader may find bibliographical references to further genetics literature  seems eminently justified.
          Some areas of genetics , especially those bordering biochemistry and microbiology, are advancing so spectacularly that a review of them can become put of date before publication. These topics cannot , however, be omkitted ; so inthese as well as other areas of rapid advance results up to 1964 or 1966, according to the  volume of the book, have been incluted. The delays associated with publication  are a familiar story , aggravated here by the need to revise my own English  text, and the further task of bringing the revision up to date . To Mrs. E. Lawton Goodman I express my sincerest thanks and due appreciation for the care and competence shown in performing her difficult task and for the improvemnents she has brought to the text. My thanks are alsoo due to Drs. Anthony Davies and S. Revell for a part of the revision...... J. A. SERRA

                                   NOTE TO PREFACE. VOLUME 3 : 
          This  volume was prepared and written in Edmonton, where the Departaments of Genetics and Zoology of the University of Alberta provided facilities for this type of work at the same time that II was a professor of genetics in the first of these departments. To the acknowledgements mentioned  in the preface note to Volume 2 Imust now add that of help in the form of bibliographical facilities through a grant from the National  Research Council of Canada.
                                 J. A. SERRA
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