The Sex Chromatin in Mammalian Cells PDF Download
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Author: Jean Catherine Hay
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Jean Catherine Hay
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Keith L. Moore
Publisher:
ISBN:
Category : Sex Chromatin
Languages : en
Pages : 504
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Book Description
Author: Susumu Ohno
Publisher: Springer Science & Business Media
ISBN: 3642881785
Category : Science
Languages : en
Pages : 201
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Book Description
Natural selection operates among individual organisms which differ in their genetic constitution. The degree of hereditary variability within a species is greatly enhanced by cross-fertilization. Indeed, the mechanism of sexual reproduction occurred very early in evolution, for it is seen today even in bacteria. In Escherichia coli, fertilization occurs by passage of the single chromosome from the male into the female bacterium (LEDERBERG, 1959). In multicellular organisms, the separation of germ from soma, and the production of haploid gametes became mandatory. The gametes were of two types. One, extremely mobile, was designed to seek out and penetrate the other, which loaded with nutrients, received the mobile gamete and intiated the development of a new individual. The foundation for true bisexuality was thus laid. In the primitive state of bisexuality, whether an individual is to be a sperm-producing male or an egg-producing female appears to be decided rather haphazardly. In the worm, Banelia viridis, the minute males are parasites in the female. Larvae that become attached to the proboscis of an adult female become males, while unattached larvae sink to the bottom and become females (BALTZER, 1935). The more sophisticated state of bisexuality was initiated by setting aside a particular pair of chromosomes for specialization and making either the male or the female a heterogametic sex. Sex chromosomes as we know them were thus born.
Author:
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ISBN: 9780815332183
Category : Cells
Languages : en
Pages : 0
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Author: Ursula Mittwoch
Publisher: Academic Press
ISBN: 1483258580
Category : Science
Languages : en
Pages : 317
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Book Description
Sex Chromosomes focuses on the study of sex chromosomes, including human chromosomal abnormalities, behavior and characteristics of chromosomes, and cell division. The book first offers information on the chromosomal basis of sex determination, as well as development of the cell theory, mitosis, fertilization, meiosis, and discovery of sex chromosomes. The publication also ponders on the mitosis, meiosis, and formation of gametes. Discussions focus on the special characteristics of sex chromosomes, abnormalities of cell division, and sexual differentiation. The manuscript reviews sex chromosomes in plants, Drosophila, and Lepidoptera. The book also examines sex-chromosome mechanisms that differ the classic type; sex chromosomes in fishes, amphibia, reptiles, and birds; and sex chromosomes in man. Discussions focus on normal human sex chromosomes, Turner's syndrome, Klinefelter's syndrome, true hermaphrodites, testicular feminization, and pseudohermaphrodites. Sex chromosomes in mammals other than man, including monotremata, marsupialia, insectivora, rodentia, and carnivora, are discussed. The publication is a dependable reference for readers interested in the study of sex chromosomes.
Author: R.S. Verma
Publisher: Elsevier
ISBN: 0080526179
Category : Medical
Languages : en
Pages : 387
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Book Description
The Genetical Theory of Natural Selection by R.A. Fisher (1930) dictated that sexual dimorphisms may depend upon a single medelian factor. This could be true for some species but his suggestion could not take off the ground as gender in Drosophila is determined by the number of X chromosomes. Technical advances in molecular biology have revived the initial thinking of Fisher and dictate that TDF or SRY genes in humans or Tdy in mice are sex determining genes. The fortuitous findings of XX males and XY female, which are generally termed sex reversal phenomenon, are quite bewildering traits that have caused much amazement concerning the pairing mechanism(s) of the pseudoautosomal regions of human X and Y chromosomes at meiosis. These findings have opened new avenues to explore further the genetic basis of sex determination at the single gene level.The aim of the fourth volume, titled Genetics of Sex Determination is to reflect on the latest advances and future investigative directions, encompassing 10 chapters. Commissioned several distinguished scientists, all pre-eminent authorities in each field to shed their thoughts concisely but epitomise their chapters with an extended bibliography. Obviously, during the past 60 years, the metoric advances are voluminous and to cover every account of genes, chromosomes, and sex in a single volume format would be a herculean task. Therefore, a few specific topics are chosen, which may be of great interest to scientists and clinicians. The seasoned scientists who love to inquire about the role of genes in sex determination should find the original work of these notable contributors very enlightening. This volume is intended for advanced students who want to keep abreast as well as for those who indulge in the search for genes of sex determination.
Author: C. Pavan
Publisher: Elsevier
ISBN: 1483185265
Category : Science
Languages : en
Pages : 448
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Mammalian Cytogenetics and Related Problems in Radiobiology covers the proceedings of a symposium held in Sao Paulo and Rio de Janeiro, Brazil in October 1962. The book focuses on the processes, methodologies, and approaches involved in mammalian cytogenetics and radiobiology. The selection first offers information on the nutrition and metabolism of cultured mammalian cells, blood technique and human chromosomes, and DNA replication in human chromosomes. Discussions focus on replication of heterochromatin in the human male; difficulties involved in the study of DNA synthesis in human chromosomes; and perspectives for future research. The text then ponders on the progress in the utilization of cell culture techniques for studies in mammalian and human somatic cell genetics and modification of radiation effects in the Ehrlich ascites tumor by oxygen or sodium azide. The manuscript examines experimental studies on mammalian chromosome aberrations, chromosome breakage in vitro, and survival of human cells in tissue culture after irradiation with densely and sparsely ionizing radiation. The text then elaborates on the observations on the morphology and behavior of normal human chromosomes, human pachytene chromosomes, and abnormalities of autosomes. The selection is a vital reference for readers interested in mammalian cytogenetics and radiobiology.
Author: Ahmad M. Khalil
Publisher:
ISBN:
Category :
Languages : en
Pages :
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ABSTRACT: Our observations indicate that XYi is extensive and persists even when the X and Y are separated in secondary spermatocytes. We also show that there are several regions that escape X inactivation in male meiosis. Further, our data suggest that similar regions escape Xi during male meiosis and Xi in female somatic cells. Trimethylation of histone H3 at lysine 4 appears to serve as an epigenetic mark for regions escaping the chromosome-wide silencing in both males and females. Xi in female somatic cells and XYi during spermatogenesis are potentially powerful experimental systems to elucidate epigenetic mechanisms of gene regulation, an understanding that will provide novel insights into the molecular events leading to many human diseases.
Author: T. C. Hsu
Publisher: Springer Science & Business Media
ISBN: 1461261597
Category : Science
Languages : en
Pages : 210
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Book Description
The history of science is mostly written retrospec tively, a generation or two after the actual events being discussed. Science historians are now analyzing and evaluating the origins of evolutionary and genetical theory in the nineteenth century and a sort of "Darwin industry" seems to have grown up. A history of mammalian cytogenetics by one of the main participants is, hence, a very welcome change, since it has a vividness, an immediacy and a personal flavor which these scholarly tomes and the official biog raphies of scientists mostly lack. The life of the author, Chinese-born, T. C. Hsu, has been a romantic and color ful one, and he is himself a unique personality, so that his book is a very unusual blend of reminiscences, history of his special field (which has transformed human genetics) and wise comments on the mistakes made along the way. The best qualities of a very fine Chinese mind have contributed to Dr. Hsu's career, including this book. Those qualities (which seem to me especially Chinese) include a kind of transparent honesty, a very direct em pirical approach to problems and superb technical ability.
Author: Alberto J. Solari
Publisher: CRC Press
ISBN: 104029409X
Category : Nature
Languages : en
Pages : 332
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Book Description
The cloning of the SRY gene and the attainment of XX mice transgenic for the Sry gene opened a new era in research on sex determination. This book surveys current knowledge of sex chromosomes and sex determination in all vertebrate classes, relying on the restriction of genetic recombination in sex chromosomes as the unifying concept of this subject. The book's interdisciplinary approach integrates contributions from the fields of cytogenetics, molecular biology, developmental biology, and evolutionary genetics. A detailed treatment of the meiotic behavior of sex chromosomes is featured, and the entire text is supplemented by numerous schemes, drawings, and electron micrographs. The book will be valuable to general cytogeneticists, vertebrate zoologists, and veterinarian and medical practitioners interested in the foundations of sex determination and the current knowledge of sex chromosomes. It will also interest students in advanced undergraduate and graduate courses in these areas.
