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Reginald Punnett
Reginald Crundall Punnett FRS (; 20 June 1875 – 3 January 1967) was a British geneticist who co-founded, with William Bateson, the ''Journal of Genetics'' in 1910. Punnett is probably best remembered today as the creator of the Punnett square, a tool still used by biologists to predict the probability of possible genotypes of offspring. His ''Mendelism'' (1905) is sometimes said to have been the first textbook on genetics; it was probably the first popular science book to introduce genetics to the public. Life and work Reginald Punnett was born in 1875 in the town of Tonbridge in Kent, England. While recovering from a childhood bout of appendicitis, Punnett became acquainted with Jardine's Naturalist's Library and developed an interest in natural history. Punnett was educated at Clifton College. Attending Gonville and Caius College, Cambridge, Punnett earned a bachelor's degree in zoology in 1898 and a master's degree in 1901. Between these degrees he worked as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tonbridge
Tonbridge ( ) is a market town in Kent, England, on the River Medway, north of Royal Tunbridge Wells, south west of Maidstone and south east of London. In the administrative borough of Tonbridge and Malling, it had an estimated population of 41,293 in 2018. History The town was recorded in the Domesday Book 1087 as ''Tonebrige'', which may indicate a bridge belonging to the estate or manor (from the Old English tun), or alternatively a bridge belonging to Tunna, a common Anglo-Saxons, Anglo-Saxon man's name. Another theory suggests that the name is a contraction of "town of bridges", due to the large number of streams the High Street originally crossed. Until 1870, the town's name was spelt ''Tunbridge'', as shown on old maps including the 1871 Ordnance Survey map and contemporary issues of the George Bradshaw, Bradshaw railway guide. In 1870, this was changed to ''Tonbridge'' by the General Post Office, GPO due to confusion with nearby Tunbridge Wells, despite Tonbridge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of St
A university () is an institution of higher (or tertiary) education and research which awards academic degrees in several academic disciplines. Universities typically offer both undergraduate and postgraduate programs. In the United States, the designation is reserved for colleges that have a graduate school. The word ''university'' is derived from the Latin ''universitas magistrorum et scholarium'', which roughly means "community of teachers and scholars". The first universities were created in Europe by Catholic Church monks. The University of Bologna (''Università di Bologna''), founded in 1088, is the first university in the sense of: *Being a high degree-awarding institute. *Having independence from the ecclesiastic schools, although conducted by both clergy and non-clergy. *Using the word ''universitas'' (which was coined at its foundation). *Issuing secular and non-secular degrees: grammar, rhetoric, logic, theology, canon law, notarial law.Hunt Janin: "The university ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambridge University Museum Of Zoology
The University Museum of Zoology is a museum of the University of Cambridge and part of the research community of the Department of Zoology. The public is welcome and admission is free (2018). The Museum of Zoology is in the David Attenborough Building (formerly known as the Arup Building) on the New Museums Site, just north of Downing Street in central Cambridge, England. The building also provides a home for the Cambridge Conservation Initiative, a biodiversity project. The museum houses an extensive collection of scientifically important zoological material. The collections were designated in 1998 by the Museums, Libraries and Archives Council (now managed by the Arts Council England) as being of outstanding historical and international importance. The museum reopened on 23 June 2018 after a major redevelopment for which it had been awarded a grant of £1.8m by the Heritage Lottery Fund. The redevelopment aimed to create a "green" building" and to create displays and new i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilhelm Weinberg
Wilhelm Weinberg (Stuttgart, 25 December 1862 – 27 November 1937, Tübingen) was a German obstetrician-gynecologist, practicing in Stuttgart, who in a 1908 paper, published in German in ''Jahresheft des Vereins für vaterländische Naturkunde in Württemberg'' (The Annals of the Society of National Natural History in Württemberg), expressed the concept that would later come to be known as the Hardy–Weinberg principle. Weinberg is also credited as the first to explain the effect of ascertainment bias on observations in genetics. Hardy–Weinberg principle Weinberg developed the principle of genetic equilibrium independently of British mathematician G.H. Hardy. He delivered an exposition of his ideas in a lecture on January 13, 1908, before the ''Verein für vaterländische Naturkunde in Württemberg'' (Society for the Natural History of the Fatherland in Württemberg), about three months before the Hardy's notes from April 1908 of that year and five months before Hardy' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hardy–Weinberg Principle
In population genetics, the Hardy–Weinberg principle, also known as the Hardy–Weinberg equilibrium, model, theorem, or law, states that allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences. These influences include ''genetic drift'', '' mate choice'', ''assortative mating'', ''natural selection'', ''sexual selection'', ''mutation'', '' gene flow'', ''meiotic drive'', ''genetic hitchhiking'', '' population bottleneck'', '' founder effect,'' ''inbreeding and outbreeding depression''. In the simplest case of a single locus with two alleles denoted ''A'' and ''a'' with frequencies and , respectively, the expected genotype frequencies under random mating are for the AA homozygotes, for the aa homozygotes, and for the heterozygotes. In the absence of selection, mutation, genetic drift, or other forces, allele frequencies ''p'' and ''q'' are constant between generations, so equilibri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cricket
Cricket is a bat-and-ball game played between two teams of eleven players on a field at the centre of which is a pitch with a wicket at each end, each comprising two bails balanced on three stumps. The batting side scores runs by striking the ball bowled at one of the wickets with the bat and then running between the wickets, while the bowling and fielding side tries to prevent this (by preventing the ball from leaving the field, and getting the ball to either wicket) and dismiss each batter (so they are "out"). Means of dismissal include being bowled, when the ball hits the stumps and dislodges the bails, and by the fielding side either catching the ball after it is hit by the bat, but before it hits the ground, or hitting a wicket with the ball before a batter can cross the crease in front of the wicket. When ten batters have been dismissed, the innings ends and the teams swap roles. The game is adjudicated by two umpires, aided by a third umpire and match referee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genetic Linkage
Genetic linkage is the tendency of DNA sequences that are close together on a chromosome to be inherited together during the meiosis phase of sexual reproduction. Two genetic markers that are physically near to each other are unlikely to be separated onto different chromatids during chromosomal crossover, and are therefore said to be more ''linked'' than markers that are far apart. In other words, the nearer two genes are on a chromosome, the lower the chance of recombination between them, and the more likely they are to be inherited together. Markers on different chromosomes are perfectly ''unlinked'', although the penetrance of potentially deleterious alleles may be influenced by the presence of other alleles, and these other alleles may be located on other chromosomes than that on which a particular potentially deleterious allele is located. Genetic linkage is the most prominent exception to Gregor Mendel's Law of Independent Assortment. The first experiment to demonstrate li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edith Rebecca Saunders
Edith Rebecca Saunders FLS (14 October 1865 – 6 June 1945) was a British geneticist and plant anatomist. Described by J. B. S. Haldane as the "Mother of British Plant Genetics", she played an active role in the re-discovery of Mendel's laws of heredity, the understanding of trait inheritance in plants, and was the first collaborator of the geneticist William Bateson. She also developed extensive work on flower anatomy, particularly focusing on the gynoecia, the female reproductive organs of flowers. Biography Saunders was born on 14 October 1865 in Brighton, England. She was educated first at Handsworth Ladies' College and in 1884 she entered the female-only Newnham College, Cambridge. There, she attended both Part I (in 1887) and II (in 1888) of the Natural Sciences Tripos. She continued to post-graduate research, and served as a demonstrator at the Balfour Biological Laboratory for Women between 1888 and 1890 (where students from Newnham and Girton colleges received pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mendelian Genetics
Mendelian inheritance (also known as Mendelism) is a type of biology, biological Heredity, inheritance following the principles originally proposed by Gregor Mendel in 1865 and 1866, re-discovered in 1900 by Hugo de Vries and Carl Correns, and later popularized by William Bateson. These principles were initially controversial. When Mendel's theories were integrated with the Boveri–Sutton chromosome theory of inheritance by Thomas Hunt Morgan in 1915, they became the core of classical genetics. Ronald Fisher combined these ideas with the theory of natural selection in his 1930 book ''The Genetical Theory of Natural Selection'', putting evolution onto a mathematics, mathematical footing and forming the basis for population genetics within the Modern synthesis (20th century), modern evolutionary synthesis. History The principles of Mendelian inheritance were named for and first derived by Gregor Johann Mendel, a nineteenth-century Moravians, Moravian monk who formulated his i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hugo De Vries
Hugo Marie de Vries () (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. Early life De Vries was born in 1848, the eldest son of Gerrit de Vries (1818–1900), a lawyer and deacon in the Mennonite congregation in Haarlem and later Prime Minister of the Netherlands from 1872 until 1874, and Maria Everardina Reuvens (1823–1914), daughter of a professor in archaeology at Leiden University. His father became a member of the Dutch Council of State in 1862 and moved his family over to The Hague. From an early age Hugo showed much interest in botany, winning several prizes for his herbariums while attending gymnasium in Haarlem and The Hague. In 1866 he enrolled at the Leiden University to major in botan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Erich Tschermak Von Seysenegg
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. Decorations and awards * Member Royal Swedish Academy of Agr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carl Correns
Carl Erich Correns (19 September 1864 – 14 February 1933) was a German botanist and geneticist notable primarily for his independent discovery of the principles of heredity, which he achieved simultaneously but independently of the botanist Hugo de Vries, and for his acknowledgment of Gregor Mendel's earlier paper on that subject. Correns was a student of Karl Nägeli, a renowned botanist with whom Mendel corresponded about his work with peas, and who subsequently engaged in a brief exchange of letters concerning reproducibility of the results in another species (Hieracium). Because of the special properties of Hieracium, those experiments failed and Mendel dropped his studies on the subject. Early life and education Carl Correns was born September 1864 in Munich. Orphaned at an early age, he was raised by an aunt in Switzerland. He entered the university of Munich in 1885. While there, he was encouraged to study botany by Carl Nägeli. After completing his thesis, Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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