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Leonard Doncaster
Leonard Doncaster (31 December 1877 – 28 May 1920) was an English geneticist and a lecturer on zoology at both Birmingham University and the University of Liverpool whose research work was largely based on insects. Early life Doncaster was born on 31 December 1877 in Abbeydale, Sheffield.His father was Samuel Doncaster, an iron merchant, of Abbeydale, Sheffield, Yorkshire. Career After education at Leighton Park School in Reading South England he studied at King's College, Cambridge, from 1896 onward. He was Scholar of natural sciences in 1898, and Walsingham Medallist in 1902. In June 1902 he was appointed assistant to the Superintendent of the Cambridge University Museum of Zoology, From 1906-10 he was a Lecturer in Zoology at Birmingham University. He was an early Mendelian geneticist who discovered sex linkage, while writing up breeding experiment results of the Reverend G.H. Raynor on the magpie moth ''Abraxas grossulariata'' published in 1906. He wrote a number o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sheffield
Sheffield is a city in South Yorkshire, England, whose name derives from the River Sheaf which runs through it. The city serves as the administrative centre of the City of Sheffield. It is historically part of the West Riding of Yorkshire and some of its southern suburbs were transferred from Derbyshire to the city council. It is the largest settlement in South Yorkshire. The city is in the eastern foothills of the Pennines and the valleys of the River Don with its four tributaries: the Loxley, the Porter Brook, the Rivelin and the Sheaf. Sixty-one per cent of Sheffield's entire area is green space and a third of the city lies within the Peak District national park. There are more than 250 parks, woodlands and gardens in the city, which is estimated to contain around 4.5 million trees. The city is south of Leeds, east of Manchester, and north of Nottingham. Sheffield played a crucial role in the Industrial Revolution, with many significant inventions an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leighton Park School
Leighton Park School is a co-educational independent school for both day and boarding pupils in Reading in South East England. The school's ethos is closely tied to the Quaker values, having been founded as a Quaker School in 1890. The school's ethos is described as achievement with values, character and community. It is one of seven Quaker schools in England. Overview The school is based in a 65-acre parkland estate just south of Reading town centre, next to the University of Reading's Whiteknights Park campus. The school has been a member of the Headmasters' and Headmistresses' Conference since 1932. It offers both the International Baccalaureate and A Levels at Sixth Form. Matthew Judd has been the headmaster since September 2018. UK Government Sixth Form analysis places Leighton Park as a top performing school for Sixth Form students' academic progress, including being the best performing school in Berkshire and one of eight schools in the country to have always appeared ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sex-limited Genes
Sex-limited genes are genes that are present in both sexes of sexually reproducing species but are expressed in only one sex and have no penetrance, or are simply 'turned off' in the other. In other words, sex-limited genes cause the two sexes to show different traits or phenotypes, despite having the same genotype. This term is restricted to autosomal traits, and should not be confused with sex-linked characteristics, which have to do with genetic differences on the sex chromosomes (see sex-determination system). Sex-limited genes are also distinguished frosex-influencedgenes, where the same gene will show differential expression in each sex. Sex-influenced genes commonly show a dominant/recessive relationship, where the same gene will have a dominant effect in one sex and a recessive effect in the other (for example, male pattern baldness). However, the resulting phenotypes caused by sex-limited genes are present in only one sex and can be seen prominently in various species t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reciprocal Cross
In genetics, a reciprocal cross is a breeding experiment designed to test the role of parental sex on a given inheritance pattern. All parent organisms must be true breeding to properly carry out such an experiment. In one cross, a male expressing the trait of interest will be crossed with a female not expressing the trait. In the other, a female expressing the trait of interest will be crossed with a male not expressing the trait. It is the cross that could be made either way or independent of the sex of the parents. For example, suppose a biologist wished to identify whether a hypothetical allele Z, a variant of some gene A, is on the male or female sex chromosome. They might first cross a Z-trait female with an A-trait male and observe the offspring. Next, they would cross an A-trait female with a Z-trait male and observe the offspring. Via principles of dominant and recessive alleles, they could then (perhaps after cross-breeding the offspring as well) make an inference as to w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sex Linkage
Sex linked describes the sex-specific patterns of inheritance and presentation when a gene mutation (allele) is present on a sex chromosome (allosome) rather than a non-sex chromosome (autosome). In humans, these are termed X-linked recessive, X-linked dominant and Y-linked. The inheritance and presentation of all three differ depending on the sex of both the parent and the child. This makes them characteristically different from autosomal dominance and recessiveness. There are many more X-linked conditions than Y-linked conditions, since humans have several times as many genes on the X chromosome than the Y chromosome. Only females are able to be carriers for X-linked conditions; males will always be affected by any X-linked condition, since they have no second X chromosome with a healthy copy of the gene. As such, X-linked recessive conditions affect males much more commonly than females. In X-linked recessive inheritance, a son born to a carrier mother and an unaffected f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James Ward (psychologist)
James Ward (27 January 1843 – 4 March 1925) was an English psychologist and philosopher. He was a Cambridge Apostle. Life Ward was born in Kingston upon Hull, the eldest of nine children. His father was an unsuccessful merchant. Ward was educated at the Liverpool Institute and Mostyn House, but his formal schooling ended when his father became bankrupt. Apprenticed to a Liverpool architect for four years, Ward studied Greek and logic and was a Sunday school teacher. In 1863, he entered Spring Hill College, near Birmingham, to train for the Congregationalist ministry. An eccentric and impoverished student, he remained at Spring Hill until 1869, completing his theological studies as well as gaining a University of London BA degree. In 1869–1870, Ward won a scholarship to Germany, where he attended the lectures of Isaac Dormer in Berlin before moving to Göttingen to study under Hermann Lotze. On his return to Britain Ward became minister at Emmanuel Congregational Church ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nature (journal)
''Nature'' is a British weekly scientific journal founded and based in London, England. As a multidisciplinary publication, ''Nature'' features peer-reviewed research from a variety of academic disciplines, mainly in science and technology. It has core editorial offices across the United States, continental Europe, and Asia under the international scientific publishing company Springer Nature. ''Nature'' was one of the world's most cited scientific journals by the Science Edition of the 2019 '' Journal Citation Reports'' (with an ascribed impact factor of 42.778), making it one of the world's most-read and most prestigious academic journals. , it claimed an online readership of about three million unique readers per month. Founded in autumn 1869, ''Nature'' was first circulated by Norman Lockyer and Alexander Macmillan as a public forum for scientific innovations. The mid-20th century facilitated an editorial expansion for the journal; ''Nature'' redoubled its efforts in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Friends' Ambulance Unit
The Friends' Ambulance Unit (FAU) was a volunteer ambulance service, founded by individual members of the British Religious Society of Friends (Quakers), in line with their Peace Testimony. The FAU operated from 1914–1919, 1939–1946 and 1946–1959 in 25 different countries around the world. It was independent of the Quakers' organisation and chiefly staffed by registered conscientious objectors. History First World War The Unit was founded as The First Anglo-Belgian Ambulance Unit at the start of World War I in 1914 and later renamed the Friends' Ambulance Unit. Members were trained at Jordans, a hamlet in Buckinghamshire, that was a centre for Quakerism. Altogether it sent over a thousand men to France, Belgium and Italy, where they worked on ambulance convoys and ambulance trains with the French and British armies. The FAU came under the jurisdiction of the British Red Cross Society. It was dissolved in 1919. Second World War and aftermath It was refounded by a c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambridge University
The University of Cambridge is a Public university, public collegiate university, collegiate research university in Cambridge, England. Founded in 1209 and granted a royal charter by Henry III of England, Henry III in 1231, Cambridge is the world's List of oldest universities in continuous operation, third oldest surviving university and one of its most prestigious, currently ranked second-best in the world and the best in Europe by ''QS World University Rankings''. Among the university's List of University of Cambridge people, most notable alumni are 11 Fields Medalists, seven Turing Award, Turing Award winners, 47 Head of state, heads of state, 14 List of prime ministers of the United Kingdom by education, British prime ministers, 194 Olympic medal-winning athletes,All Known Cambridge Olympia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lamarckism
Lamarckism, also known as Lamarckian inheritance or neo-Lamarckism, is the notion that an organism can pass on to its offspring physical characteristics that the parent organism acquired through use or disuse during its lifetime. It is also called the inheritance of acquired characteristics or more recently soft inheritance. The idea is named after the French zoologist Jean-Baptiste Lamarck (1744–1829), who incorporated the classical era theory of soft inheritance into his theory of evolution as a supplement to his concept of orthogenesis, a drive towards complexity. Introductory textbooks contrast Lamarckism with Charles Darwin's theory of evolution by natural selection. However, Darwin's book ''On the Origin of Species'' gave credence to the idea of heritable effects of use and disuse, as Lamarck had done, and his own concept of pangenesis similarly implied soft inheritance. Many researchers from the 1860s onwards attempted to find evidence for Lamarckian inheritance, but ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sex Determination And Differentiation (human)
Sexual differentiation in humans is the process of development of sex differences in humans. It is defined as the development of phenotypic structures consequent to the action of hormones produced following gonadal determination. Sexual differentiation includes development of different genitalia and the internal genital tracts and body hair plays a role in sex identification. The development of sexual differences begins with the XY sex-determination system that is present in humans, and complex mechanisms are responsible for the development of the phenotypic differences between male and female humans from an undifferentiated zygote. Females typically have two X chromosomes, and males typically have a Y chromosome and an X chromosome. At an early stage in embryonic development, both sexes possess equivalent internal structures. These are the mesonephric ducts and paramesonephric ducts. The presence of the SRY gene on the Y chromosome causes the development of the testes in males, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genetics
Genetics is the study of genes, genetic variation, and heredity in organisms.Hartl D, Jones E (2005) It is an important branch in biology because heredity is vital to organisms' evolution. Gregor Mendel, a Moravian Augustinian friar working in the 19th century in Brno, was the first to study genetics scientifically. Mendel studied "trait inheritance", patterns in the way traits are handed down from parents to offspring over time. He observed that organisms (pea plants) inherit traits by way of discrete "units of inheritance". This term, still used today, is a somewhat ambiguous definition of what is referred to as a gene. Trait inheritance and molecular inheritance mechanisms of genes are still primary principles of genetics in the 21st century, but modern genetics has expanded to study the function and behavior of genes. Gene structure and function, variation, and distribution are studied within the context of the cell, the organism (e.g. dominance), and within the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
