...How genetic diversity comes about? Genetic diversity is a branch of Biology which refers to large number of different species that can be found on earth as well the diversity within a particular species. Also, genetic diversity is affected by several ongoing natural issues that are related to mutation, sexual reproduction, migration, and the size of the population. The first issues that related are mutation. What is mutation? Mutation defined “an organism that has characteristics resulting from chromosomal alteration,” (www.thefreedictionary.com, 2008). The issue with mutation is that it permanently change the characteristics of the species involved in the mutation. This could lead to permanent loss of certain characteristics in a species. According to Concepts in Biology, “the Anopheles mosquito is responsible for transmitting malaria in many African countries,” (2008). The large number of people who fear that mutation can lead to disharmony in the environment. In addition, mutation is useful in determining evolutionary relationship. Second issue that related is sexual reproduction. What is sexual reproduction? According to Concepts in Biology, “the propagation of organisms involving the union of gametes from two parents," (2008). In human form the males carry sperm which are small and motile. The female carry eggs which provide food for embryo. In addition, male his sex organs main purposes are to produce the sperm and deliver it in the reproduction tract of a female. However...
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...Before we begin to discuss the issues related to genetic diversity, we have to know exactly what genetic diversity is all about. It is a " term used to describe genetic differences among members of a population", according to Concepts in Biology 12th Edition written by Eldon Enger. There are several topics we can discuss when speaking about genetic diversity such as mutation, sexual reproduction, migration and population size. Let's start with Mutation. Mutation brought recent information into a population by transformaing alleles that already exist. Sometimes you will find that a mutation will introduce a new allele into the gene pool of a species. Many other times, a mutation can also introduce an allele that was not present in a regional population, although it is produced in other populations of the species. For example, if a dog is a carrier of a disease causing allele, the dog can transmit this disease to a human if bitten. Initially, it may just be a few dogs that are troublesome. Over time, mutations occur that enables a significant number of dogs to be carriers. This would now be considered a major issue for humans. On another hand, you have sexual reproduction that does not originate new alleles. Sexual Reproduction incline new genetic ingredients when the genetic report from two individuals combines with one another during the process of fertilization, creating a one of a kind individual. But, this doesn't alter the incidence of alleles within...
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...Discuss the issues related to genetic diversity: mutations, sexual reproduction, migration, and population size What is genetic diversity? Genetic diversity refers to the total number of genetic characteristics in the genetic makeup of a species. “High genetic diversity indicates many different kinds of alleles for each characteristic, and low genetic diversity indicates that nearly all the individuals in the population have the same alleles”. There are certain issues related to genetic diversity which include mutations, sexual reproduction, migration, and population size. Mutations are stable changes in the DNA sequence of a gene. Mutations can be caused by many different things. They can be caused by radiation. They can also be induced by the organism itself. Mutations happen naturally when genes have dysfunctions. Modifications in DNA caused by mutations can cause errors in protein sequence, creating partially or completely non-functional proteins. “Many mutations are harmful, but very rarely one will occur that is valuable to the organism”. Sexual reproduction is the formation of a new individual following the union of two gametes. These gametes have specific needs. A gamete has to meet and unite together. They also must have food to nourish the developing embryo. “The new member may have a unique combination of characteristics so superior to those of the other members of the population that the new member will be much more successful in producing offspring”. “Migration...
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...Discuss the issues related to genetic diversity: mutations, sexual reproduction, migration, and population size What is genetic diversity? Genetic diversity refers to the total number of genetic characteristics in the genetic makeup of a species. “High genetic diversity indicates many different kinds of alleles for each characteristic, and low genetic diversity indicates that nearly all the individuals in the population have the same alleles”. There are certain issues related to genetic diversity which include mutations, sexual reproduction, migration, and population size. Mutations are stable changes in the DNA sequence of a gene. Mutations can be caused by many different things. They can be caused by radiation. They can also be induced by the organism itself. Mutations happen naturally when genes have dysfunctions. Modifications in DNA caused by mutations can cause errors in protein sequence, creating partially or completely non-functional proteins. “Many mutations are harmful, but very rarely one will occur that is valuable to the organism”. Sexual reproduction is the formation of a new individual following the union of two gametes. These gametes have specific needs. A gamete has to meet and unite together. They also must have food to nourish the developing embryo. “The new member may have a unique combination of characteristics so superior to those of the other members of the population that the new member will be much more successful in producing offspring”. “Migration...
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...evolution was further elaborated, most notably in a series of books by Theodosius Dobzhansky, Ernst Mayr, Julian Huxley and others. In this article we first summarize the history of life on Earth and provide recent evidence demonstrating that Darwin’s dilemma (the apparent missing Precambrian record of life) has been resolved. Next, the historical development and structure of the “modern synthesis” is described within the context of the following topics: paleobiology and rates of evolution, mass extinctions and species selection, macroevolution and punctuated equilibrium, sexual reproduction and recombination, sexual selection and altruism, endosymbiosis and eukaryotic cell evolution, evolutionary developmental biology, phenotypic plasticity, epigenetic inheritance and molecular evolution, experimental bacterial evolution, and computer simulations (in silico evolution of digital organisms). In addition, we discuss the expansion of the modern synthesis, embracing all branches of scientific disciplines. It is concluded that the basic tenets Dedicated to Prof. Dr. Dr. hc mult. Ernst Mayr on the occasion of his 100th birthday U. Kutschera ()) Institut für...
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...et al. 2002; Rowe & Hutchings 2003). Given that the current level of shark exploitation worldwide is far exceeding the reproductive capacity of many species and resulting in serious declines in some populations (Manire & Gruber 1990; Baum et al. 2003; Myers & Worm 2003), development of urgently needed and effective conservation measures will benefit from a more thorough understanding of shark mating systems. Field observations suggest that group reproductive behaviour and polyandrous copulations by females in a single mating event may be common in some sharks and batoids (Carrier et al. 1994; Yano et al. 1999; Pratt & Carrier 2001; Chapman et al. 2003). Several species of requiem and hammerhead sharks (families Carcharhinidae and Sphyrnidae, respectively) are also known to store sperm for several months after copulation, raising the possibility that viable sperm from multiple males can accumulate over a protracted mating season and be available for delayed fertilization (Pratt 1993; Manire et al. 1995). Despite these life-history strategies that might seem conducive to multiple paternity, the latter has been documented in only two shark species, the lemon Negaprion brevirostris and nurse shark Ginglymostoma cirratum. In both these cases, the study animals were from small populations (< 100 breeding animals) and sampled from a single location from insular breeding grounds in the tropical western Atlantic (Ohta et al. 2000; Feldheim et al. 2001, 2002; Saville et al. 2002; E. Heist...
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...Unit II: Genetics Brief Overview Reading: Chapters 3, 4, 9-12, 14 (Note: you have reviewed much of this already) The earth is teeming with living things. We can easily see some of the larger organisms—trees, grass, flowers, weeds, cats, fish, squirrels, dogs, insects, spiders, snails, mushrooms, lichens. Other organisms are everywhere, in the air, in water, soil and on our skin, but are too small to see with the naked eye—bacteria, viruses, protists (single celled eukaryotes such as amoebae), and tiny plants and animals. Life is remarkable in its complexity and diversity, and yet it all boils down to a very simple idea—the instructions for making all this life are written in nucleic acids, usually DNA. Most organisms have a set of DNA that contains the instructions for making that creature. This DNA contains four “letters” in which these instructions are written—A, T, G, and C. The only difference between the code for a dog and the code for a geranium is in the order of those letters in the code. If you took the DNA from a human and rearranged the letters in the right way, you could produce an oak tree—arrange them slightly differently and you would have a bumble bee—arrange them again and you would have the instructions for making a bacterium. Acting through more than two billion years, the process of evolution has taken one basic idea—a molecular code that uses four letters—and used it over and over, in millions of combinations to produce a dazzling array of life forms...
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...RICHARD DAWKINS-The Selfish Gene. Ebook v1.0. 'Who should read this book? Everyone interested in the universe and their place in it.' Jeffrey R. Baylis, Animal Behaviour Our genes made us. We animals exist for their preservation and are nothing more than their throwaway survival machines. The world of the selfish gene is one of savage competition, ruthless exploitation, and deceit. But what of the acts of apparent altruism found in nature-the bees who commit suicide when they sting to protect the hive, or the birds who risk their lives to warn the flock of an approaching hawk? Do they contravene the fundamental law of gene selfishness? By no means: Dawkins shows that the selfish gene is also the subtle gene. And he holds out the hope that our species-alone on earth-has the power to rebel against the designs of the selfish gene. This book is a call to arms. It is both manual and manifesto, and it grips like a thriller. The Selfish Gene, Richard Dawkins's brilliant first book and still his most famous, is an international bestseller in thirteen languages. For this new edition there are two major new chapters. 'learned, witty, and very well written...exhilaratingly good.' Sir Peter Medawar, Spectator Richard Dawkins is a Lecturer in Zoology at Oxford University and a Fellow of Mew College, and the author of The Blind Watchmaker. Preface to 1976 edition This book should be read almost as though it were science fiction. It is designed to appeal to the imagination. But it is not science...
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...Answers to Conceptual Integrated Science End-of-Chapter Questions Chapter 1: About Science Answers to Chapter 1 Review Questions 1 The era of modern science in the 16th century was launched when Galileo Galilei revived the Copernican view of the heliocentric universe, using experiments to study nature’s behavior. 2 In Conceptual Integrated Science, we believe that focusing on math too early is a poor substitute forconcepts. 3 We mean that it must be capable of being proved wrong. 4 Nonscientific hypotheses may be perfectly reasonable; they are nonscientific only because they are not falsifiable—there is no test for possible wrongness. 5 Galileo showed the falseness of Aristotle’s claim with a single experiment—dropping heavy and lightobjects from the Leaning Tower of Pisa. 6 A scientific fact is something that competent observers can observe and agree to be true; a hypothesis is an explanation or answer that is capable of being proved wrong; a law is a hypothesis that has been tested over and over and not contradicted; a theory is a synthesis of facts and well-tested hypotheses. 7 In everyday speech, a theory is the same as a hypothesis—a statement that hasn’t been tested. 8 Theories grow stronger and more precise as they evolve to include new information. 9 The term supernatural literally means “above nature.” Science works within nature, not above it. 10 They rely on subjective personal experience and do not lead to testable hypotheses. They lie outside...
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...some generalizations of the logistic model, which were used to describe growth and diffusion processes in the context of technological innovation, and for which the author studied the chaotic behaviour by means of a series of computer experiments, performed in the eighties of last century by means of the then emerging “micro-computer” technology. 1 P.-F. Verhulst and the Royal Military Academy in Brussels In the year 1844, at the age of 40, when Pierre-Fran¸ois Verhulst on November c 30 presented his contribution to the “M´moires de l’Acad´mie” of the young e e Belgian nation, a paper which was published the next year in “tome XVIII” with the title: “Recherches math´matiques sur la loi d’accroissement de la e population” (mathematical investigations of the law of population growth), he did certainly not know that his work would be the starting point for further research by Raymond Pearl and Lowell J. Reed [10, 11], by the famous A.-J. Lotka [8] and independently by Volterra [16] and later by V.A. Kostitzin [5], in the fields of mathematical biology, biometry, and demography. It was in these M´moires that he introduced a growth model for a...
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...NOTE: This PDF document has a handy set of “bookmarks” for it, which are accessible by pressing the Bookmarks tab on the left side of this window. ***************************************************** We are the last. The last generation to be unaugmented. The last generation to be intellectually alone. The last generation to be limited by our bodies. We are the first. The first generation to be augmented. The first generation to be intellectually together. The first generation to be limited only by our imaginations. We stand both before and after, balancing on the razor edge of the Event Horizon of the Singularity. That this sublime juxtapositional tautology has gone unnoticed until now is itself remarkable. We're so exquisitely privileged to be living in this time, to be born right on the precipice of the greatest paradigm shift in human history, the only thing that approaches the importance of that reality is finding like minds that realize the same, and being able to make some connection with them. If these books have influenced you the same way that they have us, we invite your contact at the email addresses listed below. Enjoy, Michael Beight, piman_314@yahoo.com Steven Reddell, cronyx@gmail.com Here are some new links that we’ve found interesting: KurzweilAI.net News articles, essays, and discussion on the latest topics in technology and accelerating intelligence. SingInst.org The Singularity Institute for Artificial Intelligence: think tank devoted to increasing...
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...Joanne Meyerowitz, ed., History and September 11th John McMillian and Paul Buhle, eds., The New Left Revisited David M. Scobey, Empire City: The Making and Meaning of the New York City Landscape Gerda Lerner, Fireweed: A Political Autobiography Allida M. Black, ed., Modern American Queer History Eric Sandweiss, St. Louis: The Evolution of an American Urban Landscape Sam Wineburg, Historical Thinking and Other Unnatural Acts: Charting the Future of Teaching the Past Sharon Hartman Strom, Political Woman: Florence Luscomb and the Legacy of Radical Reform Michael Adas, ed., Agricultural and Pastoral Societies in Ancient and Classical History Jack Metzgar, Striking Steel: Solidarity Remembered Janis Appier, Policing Women: The Sexual Politics of Law Enforcement and the LAPD Allen Hunter, ed., Rethinking the Cold War Eric Foner, ed., The New American History. Revised and Expanded Edition E SSAYS ON _ T WENTIETH- C ENTURY H ISTORY Edited by Michael Adas for the American Historical Association TEMPLE UNIVERSITY PRESS PHILADELPHIA Temple University Press 1601 North Broad Street Philadelphia, Pennsylvania 19122 www.temple.edu/tempress Copyright © 2010 by Temple University All rights reserved Published 2010 Library of Congress Cataloging-in-Publication Data Essays on twentieth century history / edited by Michael...
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.... . . . . . . . . . . . . . Design in Engineering and Architecture: Towards an Integrated Philosophical Understanding . . . . . . . . . . . . . . . . . Peter Kroes, Andrew Light, Steven A. Moore, and Pieter E. Vermaas Part I Engineering Design ix 1 Design, Use, and the Physical and Intentional Aspects of Technical Artifacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maarten Franssen Designing is the Construction of Use Plans . . . . . . . . . . . . . . . . . . . . . . . . . . Wybo Houkes The Designer Fallacy and Technological Imagination . . . . . . . . . . . . . . . . . Don Ihde Technological Design as an Evolutionary Process. . . . . . . . . . . . . . . . . . . . . Philip Brey Deciding on Ethical Issues in Engineering Design . . . . . . . . ....
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...Social Change and Modernity Edited By Hans Haferkamp and Neil J. Smelser UNIVERSITY OF CALIFORNIA PRESS Berkeley Los Angeles Oxford © 1992 The Regents of the University of California INTRODUCTION Hans Haferkamp and Neil J. Smelser Haferkamp is grateful to Angelika Schade for her fruitful comments and her helpful assistance in editing this volume and to Geoff Hunter for translating the first German version of parts of the Introduction; Smelser has profited from the research assistance and critical analyses given by Joppke. 1. Social Change and Modernity Those who organized the conference on which this volume is based—including the editors— decided to use the terms "social change" and "modernity" as the organizing concepts for this project. Because these terms enjoy wide usage in contemporary sociology and are general and inclusive, they seem preferable to more specific terms such as "evolution" "progress," "differentiation," or even "development," many of which evoke more specific mechanisms, processes, and directions of change. Likewise, we have excluded historically specific terms such as "late capitalism" and "industrial society" even though these concepts figure prominently in many of the contributions to this volume. The conference strategy called for a general statement of a metaframework for the study of social change within which a variety of more specific theories could be identified. 2. Theories of Social Change Change is such an evident feature of...
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...Create a conceptual, organized approach to the organisms studied so the student relies less on memory and more on logical pathophysiology. The text has been updated to include current information on rapidly developing topics, such as HIV and AIDS (vaccine efforts and all the new anti-HIV medications), Ebola virus, Hantavirus, E. coli outbreaks, Mad Cow Disease, and brand-new antimicrobial antibiotics. The mnemonics and cartoons in this book do not intend disrespect for any particular patient population or racial or ethnic group but are solely presented as memory devices to assist in the learning of a complex and important medical subject. We welcome suggestions for future editions. 1) Write in a conversational style for rapid assimilation. 2) Include numerous figures serving as "visual memory tools" and summary charts at the end of each chapter. These can be used for "cram sessions" after the concepts have been studied in the text. 3) Concentrate more on clinical and infectious disease issues that are both interesting and vital to the actual practice of medicine. MARK GLADWIN, MD BILL TRATTLER, MD D CONTENTS Preface v PART 1 1 2 3 BACTERIAL TAXONOMY CELL STRUCTURES, VIRULENCE FACTORS, and TOXINS...
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