Gregor Mendel

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Gregor Johann Mendel
Mendel.png
Born July 20 1822(1822-07-20)
Hynčice, 25px Austrian Empire
Died January 6 1884 (aged 61)
Brno, 25px Austria-Hungary
Fields Genetics
Institutions Abbey of St. Thomas in Brno
Alma mater University of Vienna
Known for Discovering modern genetics

Gregor Johann Mendel (July 20, 1822[1]January 6, 1884) was an Austrian Augustinian priest and scientist often called the "father of modern genetics" for his study of the inheritance of traits in pea plants. Mendel showed that the inheritance of traits follows particular laws, which were later named after him. The significance of Mendel's work was not recognised until the turn of the 20th century. Its rediscovery prompted the foundation of genetics.

Biography

Mendel was born into a German-speaking family in Hynčice, Austrian Silesia, Austria (now Czech Republic), and was baptized two days later. He was the son of Anton and Rosine Mendel and had one elder and also a younger sister. During his childhood, Mendel worked as a gardener, studied beekeeping, and as a young man attended the Philosophical Institute in Olomouc. Upon recommendation of his physics teacher Friedrich Franz, he entered the Augustinian Abbey of St. Thomas in Brno in 1843. Born Johann Mendel, he took the name Gregor upon entering monastic life. In 1851 he was sent to the University of Vienna to study, returning to his abbey in 1853 as a teacher, principally of physics.

Gregor Mendel, who is known as the "father of modern genetics", was inspired by both his professors at university and his colleagues at the monastery to study variation in plants, and he conducted his study in the monastery's garden. Between 1856 and 1863 Mendel cultivated and tested some 29,000 pea plants (i.e. Pisum sativum). This study showed that one in four pea plants had purebred recessive alleles, two out of four were hybrid and one out of four were purebred dominant. His experiments brought forth two generalisations which later became known as Mendel's Laws of Inheritance.

File:Gregor-Johann-Mendel-memorial-plaque.jpg
Gregor Johann Mendel - memorial plaque in Olomouc

Mendel read his paper, "Experiments on Plant Hybridization", at two meetings of the Natural History Society of Brünn in Moravia in 1865. When Mendel's paper was published in 1866 in Proceedings of the Natural History Society of Brünn,[2] it had little impact and was cited about three times over the next thirty-five years. His paper received plenty of criticism at the time, but is now considered a seminal work.

After Mendel completed his work with peas, he turned to experimenting with honeybees, to extend his work to animals. He produced a hybrid strain (so vicious they were destroyed), but failed to generate a clear picture of their heredity because of the difficulties in controlling mating behaviours of queen bees.

Elevated as abbot in 1868, his scientific work largely ended as Mendel became consumed with his increased administrative responsibilities, especially a dispute with the civil government over their attempt to impose special taxes on religious institutions.[3]

At first Mendel's work was rejected (and it was not widely accepted until after he died). The common belief at the time was that pangenes were responsible for inheritance. Even Darwin's theory of evolution used pangenesis instead of Mendel's model of inheritance. The modern synthesis uses Mendelian genetics.

Mendel died on January 6, 1884, in Brno, Austria-Hungary (now Czech Republic), from chronic nephritis.

Rediscovery of Mendel's work

Dominant and recessive phenotypes. (1) Parental generation. (2) F1 generation. (3) F2 generation.

It was not until the early 20th century that the importance of his ideas was realized. In 1900, his work was rediscovered by Hugo de Vries and Carl Correns. Though Erich von Tschermak was originally also credited with rediscovery, this is no longer accepted because he did not understand Mendel's laws.Template:Fix/category[citation needed] Mendel's results were quickly replicated, and genetic linkage quickly worked out. Biologists flocked to the theory, even though it was not yet applicable to many phenomena, it sought to give a genotype understanding of heredity which they felt was lacking in previous studies of heredity which focused on phenotypic approaches. Most prominent of these latter approaches was the biometric school of Karl Pearson and W.F.R. Weldon, which was based heavily on statistical studies of phenotype variation. The strongest opposition to this school came from William Bateson, who perhaps did the most in the early days of publicising the benefits of Mendel's theory (the word "genetics", and much of the discipline's other terminology, originated with Bateson). This debate between the biometricians and the Mendelians was extremely vigorous in the first two decades of the twentieth century, with the biometricians claiming statistical and mathematical rigor, whereas the Mendelians claimed a better understanding of biology. In the end, the two approaches were combined as the modern synthesis of evolutionary biology, especially by work conducted by R. A. Fisher as early as 1918.

Mendel's experimental results have later been the object of considerable dispute. Fisher analyzed the results of the F1 (first filial) ratio and found them to be implausibly close to the exact ratio of 3 to 1.[4] Only a few would accuse Mendel of scientific malpractice or call it a scientific fraud — reproduction of his experiments has demonstrated the validity of his hypothesis — however, the results have continued to be a mystery for many, though it is often cited as an example of confirmation bias. This might arise if he detected an approximate 3 to 1 ratio early in his experiments with a small sample size, and continued collecting more data until the results conformed more nearly to an exact ratio. It is sometimes suggested that he may have censored his results, and that his seven traits each occur on a separate chromosome pair, an extremely unlikely occurrence if they were chosen at random. In fact, the genes Mendel studied occurred in only four linkage groups, and only one gene pair (out of 21 possible) is close enough to show segregation distortion; this is not a pair that Mendel studied.

The standard botanical author abbreviation Mendel is applied to species he described.

Mendel, Darwin and Galton

Mendel lived around the same time as the British naturalist Charles Darwin (18091882) and many have considered a historical evolutionary synthesis of Darwinian natural selection and Mendelian genetics during their lifetimes. Mendel had read a German translation of Darwin's Origin (as evidenced by underlined passages in the copy in his monastery), after completing his experiments but before publishing his paper. Darwin did not have a copy of Mendel's paper, but he did have a book by Focke with references to it. In any event, the modern evolutionary synthesis did not start until the 1930s, by which time statistics had become advanced enough to cope with genetics and evolution.

The historian of evolution Peter J. Bowler has argued that it would not matter much if Darwin or even Galton had read Mendel, because not even Mendel was attempting to make the argument that his observed ratios were universal (he considered them to be a special case). Notwithstanding, Darwin and most of his contemporaries considered heredity to be a question best solved through observation of cell development—embryology in particular—and would not likely have been in a position to appreciate in-roads between evolution and what would become genetics (and indeed they were not appreciated until the early 20th century).[5]

See also

File:StThomasAbbeyBrno.jpg
The Augustinian Abbey of St Thomas, Brno.

References

  1. July 20 is his birthday; often mentioned is July 22, the date of his baptism. [1] Biography of Mendel at the Mendel Museum
  2. Mendel, J.G. (1866). Versuche über Plflanzenhybriden Verhandlungen des naturforschenden Vereines in Brünn, Bd. IV für das Jahr, 1865 Abhandlungen:3-47. For the English translation, see: Druery, C.T and William Bateson (1901). "Experiments in plant hybridization" (PDF). Journal of the Royal Horticultural Society. 26: 1–32. 
  3. Windle, B.C.A. (1911). "Mendel, Mendelism". Catholic Encyclopedia. Retrieved 2007-04-02. 
  4. Fisher, R. A. (1936). Has Mendel's work been rediscovered? Annals of Science 1:115-137.
  5. Peter J. Bowler, The Mendelian Revolution: The Emergence of Hereditarian Concepts in Modern Science and Society. Baltimore: Johns Hopkins University Press, 1989.

Bibliography

  • Cheryl Bardoe Gregor Mendel: The Friar who grew peas., HN Abrams, 2006.
  • William Bateson Mendel's Principles of Heredity, a Defense, First Edition, London: Cambridge University Press, 1902. On-line Facsimile Edition: Electronic Scholarly Publishing, Prepared by Robert Robbins
  • Robin Marantz Henig, Monk in the Garden: The Lost and Found Genius of Gregor Mendel, the Father of Genetics, Houghton Mifflin, May, 2000, hardcover, 292 pages, ISBN 0-395-97765-7; trade paperback, Houghton Mifflin, May, 2001, ISBN 0-618-12741-0
  • Robert Lock, Recent Progress in the Study of Variation, Heredity and Evolution, London, 1906
  • Vítězslav Orel, Gregor Mendel: the first geneticist, Oxford University Press. 1996, ISBN 0198547749
  • Reginald Punnett, Mendelism, Cambridge, 1905
  • Curt Stern and Sherwood ER (1966) The Origin of Genetics.
  • Colin Tudge In Mendel's footnotes ISBN 0-09-928875-3 book about Gregor Mendel
  • Bartel Leendert van der Waerden Mendel's experiments Centaurus 12, 275-288 (1968) refutes allegations about "data smoothing"
  • James Walsh, Catholic Churchmen in Science, Philadelphia: Dolphin Press, 1906
  • Ronald A. Fisher, "Has Mendel's Work Been Rediscovered?" Annals of Science, Volume 1, (1936): 115-137. Discusses the possibility of fraud in his research.

External links

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Persondata
NAME Mendel, Gregor Johann
ALTERNATIVE NAMES
SHORT DESCRIPTION Genetics
DATE OF BIRTH July 20 1822(1822-07-20)
PLACE OF BIRTH Heinzendorf, Silesia
DATE OF DEATH January 6 1884
PLACE OF DEATH Brno, Moravia

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