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Genetics
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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.

Table of contents
1 Closely-related fields
2 Brief history
3 Timeline of notable discoveries in genetics
4 See also
5 External links

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

Research institutes involved in genetics research

Americas

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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