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Genetics
Genetics is the science of genes, heredity, and the variation of organisms.
Humans began applying knowledge of genetics in prehistory with the domestication and breeding of plants and animals. In modern research, genetics provides important tools in the investigation of the function of a particular gene, e.g. analysis of genetic interactions. Within organisms, genetic information generally is carried in chromosomes, where it is represented in the chemical structure of particular DNA molecules.
Closely-related fields
The science which grew out of the union of biochemistry and genetics is widely known as molecular biology.
The term "genetics" is often widely conflated with the notion of genetic engineering, where the DNA of an organism is modified for some kind of practical end, but most research in genetics is aimed at understanding and explaining the effect of genes on phenotypes and in the role of genes in populations (see population genetics and ecological genetics), rather than genetic engineering. A more recent development is the rise of genomics, which attempts the study of large-scale genetic patterns across the genome for (and in principle, all the DNA in) a given species.
The study of inherited features not strictly associated with changes in the DNA sequence is called epigenetics.
Some take the view that life can be defined, in molecular terms, as the set of strategies which RNA polynucleotides have used and continue to use to perpetuate themselves. This definition grows out of work on the origin of life, specifically the RNA world hypothesis.
Brief history
It wasn't until 1865 that Gregor Mendel first traced inheritance patterns of certain traits in pea plants and showed that they obeyed simple statistical rules. Although not all features show this Mendelian inheritance, his work acted as a proof that application of statistics to inheritance could be highly useful. Since that time many more complex forms of inheritance have been demonstrated.
From his statistical analysis Mendel defined a concept that he described as an allele, which was the fundamental unit of heredity. The term allele as Mendel used it is nearly synonymous with the term gene, whilst the term allele now means a specific variant of a particular gene.
The significance of Mendel's work was not understood until early in the twentieth century, after his death, when his research was re-discovered by other scientists working on similar problems.
Mendel was unaware of the physical nature of the gene. We now know that genetic information is normally carried on DNA. (Certain viruses store their genetic information in RNA). Manipulation of DNA can in turn alter the inheritance and features of various organisms.
Genes encode the information necessary for synthesizing proteins, which, in turn play a large role in influencing, although, in many instances, do not completely determine, the final phenotype of the organism.
Timeline of notable discoveries in genetics
- 1859 Charles Darwin publishes The Origin of Species
- 1865 Gregor Mendel's paper, Experiments on Plant Hybridization
- 1903 Chromosomes are discovered to be hereditary units
- 1905 British biologist William Bateson coins the term "genetics" in a letter to Adam Sedgwick
- 1910 Chromosomes include genes
- 1918 Ronald Fisher publishes On the correlation between relatives on the supposition of Mendelian inheritance - the modern synthesis starts.
- 1913 Gene maps show chromosomes containing linear arranged genes
- 1927 Physical changes in genes are called mutations
- 1928 Frederick Griffith discovers a hereditary molecule that is transmissible between bacteria (see Griffiths experiment)
- 1931 Crossing over is the cause of recombination
- 1944 Oswald Theodore Avery, Colin McLeod and Maclyn McCarty isolate DNA as the genetic material (at that time called transforming principle)
- 1945 Genes code for proteins; see the original central dogma of genetics
- 1950 Erwin Chargaff shows that the four nucleotides are not present in nucleic acids in stable proportions, but that some general rules appear to hold (e.g., that the amount of adenine, A, tends to be equal to that of thymine, T).
- 1952 The Hershey-Chase experiment proves the genetic information of phages (and all other organisms) to be DNA
- 1953 DNA structure is resolved to be a double helix by James D. Watson and Francis Crick
- 1958 The Meselson-Stahl experiment demonstrates that DNA is semiconservatively replicated
- 1961 The genetic code is arranged in triplets
- 1977 DNA is sequenced
- 1997 First genome sequenced
- 2001 First draft sequences of the human genome are released simultaneously by the Human Genome Project and Celera Genomics.
- 2003 (14 April) Successful completion of Human Genome Project with 99% of the genome sequenced to a 99.99% accuracy [1]
See also
Related topics
People working in genetic research
Companies related to genetic research
- Affymetrix, UK [1]
- Applied Biosystems, Foster City, CA [1]
- Celera Genomics
- Genentech, San Francisco, CA [1]
- Applera Norwalk, CT [1]
- Genetix, Hampshire, UK [1]
- The NanoAging Institute, Québec, UK [1]
Research institutes involved in genetics research
Americas
- Arizona, USA
- Translational Genomics Research Institute, Phoenix founded in July of 2002 [1]
- Arkansas, USA
- California, USA
- Florida, USA
- University of Florida Genetics Institute, Miami [1]
- Maryland, USA
- Massachusetts, USA
- Whitehead Institute Center for Genome Research, Cambridge, USA, [1]
- New York, USA
- Washington, DC, USA
- Research Institute for Genetic and Human Therapy - Instituto di Ricerca per la Terapia Genetica Umana, [1]
- USA
Europe
- Austria
- Germany
- Zentrum für genetische Forschung, (part of Max-Planck-Institute für Psychiatrie und Biochemie) München
- Institut für Humangenetik, Hamburg [1]
- Institut für Humangenetik, (Klinikum der Ruprecht-Karls-Universität Heidelberg), Heidelberg [1]
- Institut für Humangenetik, (Friedrich-Alexander-Universität), Erlangen-Nürnberg [1]
- Institut für Humangenetik (Friedrich-Wilhelms-Universität), Bonn [1]
- Institut für Humangenetik, (Universität Lübeck), Lübeck [1]
- Max Planck Institute for Molecular Genetics, Berlin [1]
- European Molecular Biology Lab (EMBL), Heidelberg
- Italy
- International Plant Genetic Resources Institute, Maccarese (Fiumicino) [1]
- UK
Asia/Pacific
Africa
Genetic research watchdog organizations
External links
Related publications
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The Center for the Study of Technology and Society - Biotechnology A field that brings together agriculture, genetics, cloning, health, medicine and reproductive technology. The Center is a nonprofit research and educational group based in Washington, D.C. http://www.tecsoc.org/biotech/biotech.htm
HumGen - Human Genetics University of Montreal - CRDP. Access to a wide range of information: credible, relevant policy statements on topics related to human genetics around the world. http://www.humgen.umontreal.ca/en/
Foundation for Genetic Medicine, Inc. Organization formed to keep opinion leaders abreast of the most recent scientific and social developments related to human genetics. http://geneticmedicine.org
Who Owns the Human Genetic Code? An Annotated Bibliography Article on whether or not the United States Patent Office should issue patents on gene sequences . http://www.udayton.edu/~health/05bioethics/00ammons.htm
Agrifood Awareness Australia Industry initiative, established to increase public awareness of, and encourage informed debate about, gene technology. http://www.afaa.com.au
Genetic Engineering, Biotechnology & Industrial Property Rights Novartis Foundation for Sustainable Development (NFSD): ethical and ecological aspects of industrial property rights in the context of genetic engineering and biotechnology. http://www.syngentafoundation.com/genetic_engineering_biotechnology.htm
Biotechnology: Gateway to Environmental Destruction A brief argument against the use of biotechnology in agriculture and the creation of genetically modified foods. The argument consists of eleven main assertions supported by detailed research. http://www.geocities.com/biotechdoubts/
Center for Genetics and Society A pro-choice organization working for sensible policies on genetic engineering technology. Excellent resources and links. http://www.genetics-and-society.org
Critical Genetics Project Information about the scientific basis of genetic engineering and related aspects of biotechnology. http://www.criticalgenetics.org/
National Information Resource on Ethics & Human Genetics Compilation of links, journals and other publications that offer research about the ethical and moral aspects of applying genetic knowledge to humans. http://www.georgetown.edu/research/nrcbl/nirehg/
Planet Earth Issues Collection of articles about environment, race, and genetic issues. http://www.geocities.com/beckermanlin/index.html
Scope Note Series Essays on genetic screening, eugenics and gene therapy, from National Reference Center for Bioethics Literature, Georgetown University, Washington, DC. http://www.georgetown.edu/research/nrcbl/scopenotes/
Counterbalance.org: Genetics and Ethics A Christian site that attempts to address the ethical, religious, and moral issues raised by a broad range of applications of genetics research. http://www.counterbalance.net/genetics/intro-frame.html
Human Genome Project: Ethical, Legal, & Social Issues Explores the ethical, legal, and social issues (ELSI) surrounding availability of genetic information, as it pertains to privacy and the potential for discrimination. http://www.ornl.gov/sci/techresources/Human_Genome/elsi/elsi.shtml
Eugenics, Genetic Engineering, and Cloning Considerations and arguments on several scientific procedures that possibly could improve human life. http://author.senescence.info/thoughts/genetics.html
Genetic Engineering - Paradise on Earth or a Descent into Hell? By Keith Parkins. Long article, with a huge list of references at the end. http://www.heureka.clara.net/gaia/genetics.htm
Articles about genetic engineering Many negative articles covering the genetic engineering of plants, animals and human beings. http://www.anth.org/IFGENE/articles.htm
Council For Responsible Genetics Advocacy and coalition building form the core of the CRG's work in our program areas of genetic discrimination, patenting of life forms, and food safety and environmental quality. http://www.gene-watch.org/
Greenpeace International Genetic Engineering Campaign Information and news about the worldwide anti-GE campaign and press releases. http://www.greenpeace.org/~geneng/index.html
Genetic Engineering Organization Geenor attempts to increase public awareness about genetic engineering through online articles and software. http://www.geneticengineering.org/
Eubios Ethics Institute A non-profit group founded by Darryl Macer in Christchurch, New Zealand and in Tsukuba Science City, Japan. Site provides links, general information and conference abstracts. http://zobell.biol.tsukuba.ac.jp/~macer/
Biotechnology/Biosafety links from the Third World Network
http://www.twnside.org.sg/bio.htm
Centre for Law & Genetics Resources on the Commercialisation of Genetics and its legal consequences. http://www.lawgenecentre.org
Bioethics in the Classroom
http://www.accessexcellence.org/21st/TE/BE
Embracing Change with All Four Arms This paper sets out to defend human genetic engineering witha new bioethical approach, post-humanism. http://www.changesurfer.com/Hlth/Genetech.html
HumGen Canadian-based site provides access to national, regional and international, policy statements on topics relating to human genetics. http://www.humgen.umontreal.ca
The Food and Drink Federation Foodfuture Programme Aims to improve public understanding of genetic modification. The programme has initiated wider discussion of the technology - the perceived benefits and disadvantages as well as the ethical and moral concerns. http://www.foodfuture.org.uk
San Francisco State University: Genetic Engineering and Its Dangers Essays, links to resources and a bibliography compiled by Dr Ron Epstein at the Philosophy Department. Categories include ethical and religious questions, biowarfare, and genetic engineering on humans. http://online.sfsu.edu/%7Erone/GEessays/gedanger.htm
Australian Gene Ethics Network Non-profit federation of groups and individuals in Australia promoting critical discussion and debate on the environmental, social and ethical impacts of genetic engineering technologies. http://www.geneethics.org
ELSI - Human Genome Project Primarily a collection of links to sites exploring the ELSI. http://www.kumc.edu/gec/prof/geneelsi.html
International Forum for Genetic Engineering Ifgene encourages a deeper dialogue about genetic engineering by giving special attention to: the worldviews out of which people approach science and its application to genetic engineering (biotechnology); the moral and spiritual implications of genetic engineering. http://www.anth.org/ifgene/
National Reference Center for BioEthics Literature
http://www.georgetown.edu/research/nrcbl/
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