Erich Tschermak, Edler von Seysenegg (15 November 1871 – 11 October 1962) was an Austrian agronomist who developed several new disease-resistant crops, including wheat-rye and oat hybrids. He was a son of the Moravia-born mineralogist Gustav Tschermak von Seysenegg. His maternal grandfather was the botanist, Eduard Fenzl, who taught Gregor Mendel botany during his student days in Vienna.
He received his doctorate from the University of Halle, Germany, in 1896. Tschermak accepted a teaching position at the University of Agricultural Sciences Vienna in 1901, and became professor there five years later, in 1900. Von Tschermak is one of four men—see also Hugo de Vries, Carl Correns and William Jasper Spillman—who independently rediscovered Gregor Mendel's work on genetics. Von Tschermak published his findings in June, 1900. His works in genetics were largely influenced by his brother Armin von Tschermak-Seysenegg.
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In biology, the word gene (from γένος, génos; meaning generation or birth or gender) can have several different meanings. The Mendelian gene is a basic unit of heredity and the molecular gene is a sequence of nucleotides in DNA that is transcribed to produce a functional RNA. There are two types of molecular genes: protein-coding genes and noncoding genes. During gene expression, the DNA is first copied into RNA. The RNA can be directly functional or be the intermediate template for a protein that performs a function.
Hugo Marie de Vries (ˈɦyɣoː də ˈvris) (16 February 1848 – 21 May 1935) was a Dutch botanist and one of the first geneticists. He is known chiefly for suggesting the concept of genes, rediscovering the laws of heredity in the 1890s while apparently unaware of Gregor Mendel's work, for introducing the term "mutation", and for developing a mutation theory of evolution.
Gregor Johann Mendel OSA (ˈmɛndəl; Řehoř Jan Mendel; 20 July 1822 – 6 January 1884) was a German-Czech biologist, meteorologist, mathematician, Augustinian friar and abbot of St. Thomas' Abbey in Brno (Brünn), Margraviate of Moravia. Mendel was born in a German-speaking family in the Silesian part of the Austrian Empire (today's Czech Republic) and gained posthumous recognition as the founder of the modern science of genetics.