Download or read book Cytogenetics and Sex Determination in Collared Lemmings written by Gordon Hamilton Jarrell and published by . This book was released on 1989 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetics of Sex Determination written by R.S. Verma and published by Elsevier. This book was released on 1996-04-23 with total page 387 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Population Cytogenetics and Population Radiation Ecology written by V. N. Orlov and published by Routledge. This book was released on 1989 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wildlife Review written by and published by . This book was released on 1990 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evolution Composition and Regulation of Supernumerary B Chromosomes written by Andreas Houben and published by MDPI. This book was released on 2019-04-25 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Supernumerary B chromosomes (Bs) are dispensable genetic elements found in thousands of species of plants and animals, and some fungi. Since their discovery more than a century ago, they have been a source of puzzlement, as they only occur in some members of a population and are absent from others. When they do occur, they are often harmful, and in the absence of “selfishness”, based on mechanisms of mitotic and meiotic drive, there appears to be no obvious reason for their existence. Cytogeneticists have long wrestled with questions about the biological existence of these enigmatic elements, including their lack of any adaptive properties, apparent absence of functional genes, their origin, sequence organization, and co-evolution as nuclear parasites. Emerging new technologies are now enabling researchers to step up a gear, to look enthusiastically beyond the previous limits of the horizon, and to uncover the secrets of these “silent” chromosomes. This book provides a comprehensive guide to theoretical advancements in the field of B chromosome research in both animal and plant systems.
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1989 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Arctic written by and published by . This book was released on 1984 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1990 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cumulated Index Medicus written by and published by . This book was released on 1998 with total page 1792 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Zoology written by and published by . This book was released on 1993 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book B Chromosomes in the Eukaryote Genome written by Juan Pedro M. Camacho and published by S. Karger AG (Switzerland). This book was released on 2004 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: B chromosomes are additional passengers found in the karyotypes of about 15% of eukaryote species. They are best understood as genome parasites exploiting the host genome because of their transmissional advantage, and are frequently deleterious for the organism carrying them. Since the last compilation of B chromosome literature more than 20 years ago, many new findings have contributed to building an increasing body of knowledge of these mysterious genetic elements. This single topic issue of Cytogenetic and Genome Research updates these new data in its 40 papers authored by researchers from 19 countries. It provides up-to-date reviews on plants, fish, amphibians and mammals and, for the first time, on Sternorrhyncha hemipterans, decapodan crustaceans, helminth parasites and lizards. It also presents new original data on many aspects of B chromosomes including their definition, new occurrences, frequency, structure, composition, origin, effects on the host genome, transmission and population dynamics. Unique in its field, this publication is recommended reading for cytogeneticists interested in chromosome polymorphisms, for evolutionary biologists interested in selfish genetic elements, and for geneticists interested in the intragenomic conflict.
Download or read book Index Medicus written by and published by . This book was released on 2002 with total page 1568 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. for 1963- include as pt. 2 of the Jan. issue: Medical subject headings.
Download or read book Genes in Conflict written by Austin Burt and published by Harvard University Press. This book was released on 2006 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt: In evolution, most genes survive and spread within populations because they increase the ability of their hosts (or their close relatives) to survive and reproduce. But some genes spread in spite of being harmful to the host organism—by distorting their own transmission to the next generation, or by changing how the host behaves toward relatives. As a consequence, different genes in a single organism can have diametrically opposed interests and adaptations.Covering all species from yeast to humans, Genes in Conflict is the first book to tell the story of selfish genetic elements, those continually appearing stretches of DNA that act narrowly to advance their own replication at the expense of the larger organism. As Austin Burt and Robert Trivers show, these selfish genes are a universal feature of life with pervasive effects, including numerous counter-adaptations. Their spread has created a whole world of socio-genetic interactions within individuals, usually completely hidden from sight.Genes in Conflict introduces the subject of selfish genetic elements in all its aspects, from molecular and genetic to behavioral and evolutionary. Burt and Trivers give us access for the first time to a crucial area of research—now developing at an explosive rate—that is cohering as a unitary whole, with its own logic and interconnected questions, a subject certain to be of enduring importance to our understanding of genetics and evolution.
Download or read book Bibliography of Reproduction written by and published by . This book was released on 1992-07 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Evolution of Sex Determination written by Leo Beukeboom and published by OUP Oxford. This book was released on 2014-06-12 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sexual reproduction is a fundamental aspect of life. It is defined by the occurrence of meiosis and the fusion of two gametes of different sexes or mating types. Sex-determination mechanisms are responsible for the sexual fate and development of sexual characteristics in an organism, be it a unicellular alga, a plant, or an animal. In many cases, sex determination is genetic: males and females have different alleles or different genes that specify their sexual morphology. In animals, this is often accompanied by chromosomal differences. In other cases, sex may be determined by environmental (e.g. temperature) or social variables (e.g. the size of an organism relative to other members of its population). Surprisingly, sex-determination mechanisms are not evolutionarily conserved but are bewilderingly diverse and appear to have had rapid turnover rates during evolution. Evolutionary biologists continue to seek a solution to this conundrum. What drives the surprising dynamics of such a fundamental process that always leads to the same outcome: two sex types, male and female? The answer is complex but the ongoing genomic revolution has already greatly increased our knowledge of sex-determination systems and sex chromosomes in recent years. This novel book presents and synthesizes our current understanding, and clearly shows that sex-determination evolution will remain a dynamic field of future research. The Evolution of Sex Determination is an advanced, research level text suitable for graduate students and researchers in genetics, developmental biology, and evolution.
Download or read book North American Rodents written by David J. Hafner and published by IUCN. This book was released on 1998 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first comprehensive treatment of North American rodents of conservation concern. This action plan summarizes the rodent fauna of North America and provides available information on every rodent taxon that has been considered to be of conservation concern by state, provincial and private conservation agencies and regional experts. It is hoped that the survey provided in this action plan will serve as a common ground for all these parties in drawing up conservation strategies for rodents.
Download or read book Biological Agricultural Index written by and published by . This book was released on 1993 with total page 2728 pages. Available in PDF, EPUB and Kindle. Book excerpt:
