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Welcome to Wikipedia,the free encyclopedia that anyone can edit.2,451,726 articles in EnglishArtsBiographyGeographyHistoryMathematicsScienceSocietyTechnologyAll portalsOverview · Editing · Questions · HelpContents · Categories · Featured content · A–Z indexToday’s featured articleGenetics, a discipline of biology, is the science of heredity and variation in living organisms. The fact that living things inherit traits from their parents has been used since prehistoric times to improve crop plants and animals through selective breeding. However, the modern science of genetics, which seeks to understand the process of inheritance, only began with the work of Gregor Mendel in the mid-nineteenth century. Although he did not know the physical basis for heredity, Mendel observed that organisms inherit traits in a discrete manner—these basic units of inheritance are now called genes. Genes correspond to regions within DNA, a molecule composed of a chain of four different types of nucleotides—the sequence of these nucleotides is the genetic information organisms inherit. The sequence of nucleotides in a gene is translated by cells to produce a chain of amino acids, creating proteins—the order of amino acids in a protein corresponds to the order of nucleotides in the gene. The amino acids in a protein determine how it folds into a three-dimensional shape; this structure is, in turn, responsible for the protein’s function. Proteins carry out almost all the functions needed for cells to live. A change to the DNA in a gene can change a protein’s amino acids, changing its shape and function: this can have a dramatic effect in the cell and on the organism as a whole. (more…)Recently featured: To Kill a Mockingbird – R.E.M. – AtomArchive – By email – More featured articles…Did you know…From Wikipedia’s newest articles:… that the Gero Cross of about 970 AD is one of the earliest known depictions of the dead Christ on the cross?… that Walt Whitman and Theodore Roosevelt frequently visited Chichester’s Inn in West Hills, New York?… that Humphrey Littleton informed on a priest wanted in connection with the Gunpowder Plot after seeing him give mass at Hindlip Hall?… that the Australian banana fig is one of the few figs known to be pollinated by more than one species of fig wasp?… that Japanese mathematician Yozo Matsushima received the Asahi Prize for his research on continuous groups in 1962?… that every person detained by the International Criminal Court has a personal computer in his cell?… that in 1846, George Pope Morris was one of two founders of the periodical that would become Town & Country, which is still published today?Archive – Start a new article…In the newsThree members of the Turkish police force are killed during an armed attack on the United States consulate (pictured) in Istanbul, with three attackers also dead.India submits its nuclear safeguards agreement to the International Atomic Energy Agency to implement the Indo-US nuclear deal.In Grenada, Tillman Thomas succeeds Keith Mitchell as the new Prime Minister following the National Democratic Congress’ win in the general elections.Iran test-fires the Shahab-3, a missile with an operating range of 2,100 km (1,300 mi), amid rising international tensions over the country’s nuclear program.Leaders of the nations meeting in Japan for the 34th G8 summit agree to a target of cutting world greenhouse gas emissions by at least 50 percent by 2050.A suicide bomber rams a car bomb into the Indian embassy in Kabul, Afghanistan, killing 58 people.Wikinews – Recent deaths – More current events…On this day…July 12: The Twelfth in Northern Ireland1543 – King Henry VIII of England married Catherine Parr (pictured), his sixth and last wife, at Hampton Court Palace.1690 – Williamite forces defeated Jacobite troops at the Battle of the Boyne just outside Drogheda, Ireland, marking a turning point in the Williamite War.1806 – Sixteen German states left the Holy Roman Empire and formed the Confederation of the Rhine.1862 – The Medal of Honor, the highest military decoration awarded by the United States government, was first authorized by the U.S. Congress.1979 – The Gilbert Islands gained independence from the United Kingdom and became known as Kiribati.2006 – Hezbollah forces crossed the Israel–Lebanon border and attacked Israeli military positions, sparking the July War.More events: July 11 – July 12 – July 13Archive – By email – More anniversaries…It is now 04:50, July 12, 2008 (UTC) – Refresh this pageToday’s featured pictureAn 1896 engraving of the interior of the New Synagogue, Berlin. The synagogue was noted for its Moorish style and resemblance to the Alhambra. During the Kristallnacht pogrom of 1938, the Synagogue was set ablaze. Today the synagogue serves as an exhibit for various aspects of the Holocaust, particularly Kristallnacht.Image credit: Wilhelm Ernst and SohnRecently featured: Computed tomography – Hoverfly poster – David FarragutArchive – More featured pictures…