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The nature of the evolutionary process; Chromosome structure; Salivary gland chromosomes; The mechanism of structural rearrangements; The mechanism of meiosis; Meiosis in strucutural heterozygotes; Chromosomal poymorphism in natural populations; Supernumery chromosomes in natural populations; Evolution of meiosis and athe chromosome cycle; Hybridization as a technique of experimental taxonomy and the causes of hybrid sterility; The evolution of sex determination; Simple sexchromosome mechanisms; Multiple sexchromosome; Sex determination by male haploidey. The evolution of pasthenogenesis.
This book offers a sampling of cytological features and patterns as an aid to study, revision and continuing education for veterinarians in practice and training, for veterinary students, nurses, and technicians. The cases are presented randomly, are illustrated by 267 photomicrographs in full color, and appear as self-assessment questions and detailed explanatory answers. Species covered include the dog, the cat, and the horse, with additional material on the cow.
This book presents animal cytology as a science of seeing and interpreting chromosome form and behaviour, and of appreciating its evolutionary significance. Its principal objective is to help students develop a basic understanding and confidence on all matters relating to animal chromosomes.
This 1981 collection focuses on a wide range of topics in the general field of evolutionary biology. The authors have all been associated with Professor M. J. D. White, who was the world authority on chromosomal evolution and speciation, to whom this volume was presented on his seventieth birthday.
The chromosomes--the microscopic structures that contain DNA and carry the genetic information for all living things--are among the most fundamental and fascinating components of life. In this concise yet comprehensive monograph, White provides an accessible overview of the various types of chromosomes, their structures and functions, and their vital role in genetics and evolution. A must-read for anyone interested in genetics or molecular biology. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Sex is the queen of problems in evolutionary biology. Generations of researchers have investigated one of the last remaining evolutionary paradoxes: why sex exists at all. Given that sexual reproduction is costly from an evolutionary point of view, one could wonder why not all animals and plants reproduce asexually. Dozens of contemporary hypotheses attempt to explain the prevalence of sex and its advantages and predict the early extinction of fully asexual lineages. The major theme of this book is: what is the fate of animal and plant groups in which sex is lost? Initial chapters discuss theory behind asexual life: what major disadvantages do asexual groups have to face, what are the genetic and ecological consequences and what does this theory predict for more applied aspects of asexual life, for example in agricultural pests, diseases as well as in cultural crops such as grapes. Cases studies in many animals (focusing on both invertebrates and vertebrates) and plants reveal parallel, but also singularly novel adaptations to the absence of meiosis and syngamy. And last but not least, are asexuals really doomed to early extinction or do genuine ancient asexuals exist? This book assembles contributions from the most important research groups dealing with asexual evolution in eukaryotes. It is a milestone in research on parthenogenesis and will be useful to undergraduate as well as graduate students and to senior researchers in all fields of evolutionary biology, as the paradox of sex remains its queen of problems.
Exotic Animal Hematology and Cytology, Fourth Edition updates the most comprehensive reference available on exotic animal hematology and cytology of all major species. Acts as both an atlas and a text, offering high-quality photographs and step-by-step descriptions of techniques associated with preparing and interpreting hematology and cytology samples Presents complete information on hematology and cytology in a wide range of exotic species, including small mammals, birds, reptiles, amphibians, and fish Includes more than 700 high-quality color photographs, now with sizing bars Takes a new disease-based structure for improved ease of use Provides straightforward step-by-step descriptions of sample preparation and interpretation