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Inherited Accessory Nail Of The Fifth Toe
The accessory nail of the fifth toe, also known as petaloid toenail, is a physical trait of the small toe, where a minuscule "sixth toenail" is present in the outer corner of the nail situated on the smallest toe. Trait The trait can be observed on either one or both feet, where there is a separation of the toenail situated on the smallest toe. The separated part of the nail forms a smaller "sixth toenail" on the corner of the larger, or "main" section of the toenail, on the outermost side of the foot, which protrudes outwards from the corner of the larger nail. The additional "nail" can be cut with a nail clipper, just like any other nail. Genome-wide scans indicate that it is a heritable trait. However, instead of following a Mendelian pattern of inheritance, it is likely to be a complex trait affected by multiple genes with minor genetic effects. Removal Many people do not request or seek out removal, as the accessory nail typically does not cause symptoms. Surgical or ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nail Clipper
A nail clipper (also called nail clippers, a nail trimmer, a nail cutter or nipper type) is a hand tool used to trim fingernails, toenails and hangnails. Design Nail clippers are usually made of stainless steel but can also be made of plastic and aluminum. Two common varieties are the plier type and the compound lever type. Many nail clippers usually come with a miniature file fixed to it to allow rough edges of nails to be manicured. Nail clippers occasionally come with a nail catcher. The nail clipper consists of a head that may be concave or convex. Specialized nail clippers which have convex clipping ends are intended for trimming toenails, while concave clipping ends are for fingernails. The cutting head may be manufactured to be parallel or perpendicular to the principal axis of the cutter. Cutting heads that are parallel to the principal axis are made to address accessibility issues involved with cutting toenails. History Before the invention of the modern nail clippe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genome-wide Association Study
In genomics, a genome-wide association study (GWA study, or GWAS), also known as whole genome association study (WGA study, or WGAS), is an observational study of a genome-wide set of Single-nucleotide polymorphism, genetic variants in different individuals to see if any variant is associated with a trait. GWA studies typically focus on associations between single-nucleotide polymorphisms (SNPs) and traits like major human diseases, but can equally be applied to any other genetic variants and any other organisms. When applied to human data, GWA studies compare the DNA of participants having varying phenotypes for a particular trait or disease. These participants may be people with a disease (cases) and similar people without the disease (controls), or they may be people with different phenotypes for a particular trait, for example blood pressure. This approach is known as phenotype-first, in which the participants are classified first by their clinical manifestation(s), as oppose ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mendelian Inheritance
Mendelian inheritance (also known as Mendelism) is a type of biological 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 mathematical footing and forming the basis for population genetics within the modern evolutionary synthesis. History The principles of Mendelian inheritance were named for and first derived by Gregor Johann Mendel, a nineteenth-century Moravian monk who formulated his ideas after conducting simple hybridisation experiments with pea plants (' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Han Chinese
The Han Chinese () or Han people (), are an East Asian ethnic group native to China. They constitute the world's largest ethnic group, making up about 18% of the global population and consisting of various subgroups speaking distinctive varieties of the Chinese language. The estimated 1.4 billion Han Chinese people, worldwide, are primarily concentrated in the People's Republic of China (including Mainland China, Hong Kong and Macau) where they make up about 92% of the total population. In the Republic of China (Taiwan), they make up about 97% of the population. People of Han Chinese descent also make up around 75% of the total population of Singapore. Originating from Northern China, the Han Chinese trace their cultural ancestry to the Huaxia, the confederation of agricultural tribes living along the Yellow River. This collective Neolithic confederation included agricultural tribes Hua and Xia, hence the name. They settled along the Central Plains around the middle and lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yellow Emperor
The Yellow Emperor, also known as the Yellow Thearch or by his Chinese name Huangdi (), is a deity ('' shen'') in Chinese religion, one of the legendary Chinese sovereigns and culture heroes included among the mytho-historical Three Sovereigns and Five Emperors and cosmological Five Regions' Highest Deities (). Calculated by Jesuit missionaries on the basis of Chinese chronicles and later accepted by the twentieth-century promoters of a universal calendar starting with the Yellow Emperor, Huangdi's traditional reign dates are 2697–2597 or 2698–2598 BC. Huangdi's cult became prominent in the late Warring States and early Han dynasty, when he was portrayed as the originator of the centralized state, as a cosmic ruler, and as a patron of esoteric arts. A large number of texts – such as the ''Huangdi Neijing'', a medical classic, and the '' Huangdi Sijing'', a group of political treatises – were thus attributed to him. Having waned in influence during most of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Qiang (historical People)
Qiang () was a name given to various groups of people at different periods in ancient China. The Qiang people are generally thought to have been of Tibeto-Burman origin, though there are other theories. The Tangut people of the Tang, Sung and Yuan dynasties may be of Qiang descent. The modern Qiang people as well as Tibetans may also have been descended in part from the ancient Qiangs. Etymology According to the Han dynasty dictionary ''Shuowen Jiezi'', the Qiang were shepherds, and the Chinese character for Qiang () was thus formed from the characters for "sheep" (羊) and "man" (人), and pronounced like "sheep".Shouwen Original text: 羌：西戎牧羊人也。从人从羊，羊亦聲。 '''' also men ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henan
Henan (; or ; ; alternatively Honan) is a landlocked province of China, in the central part of the country. Henan is often referred to as Zhongyuan or Zhongzhou (), which literally means "central plain" or "midland", although the name is also applied to the entirety of China proper. Henan is a birthplace of Han Chinese civilization, with over 3,200 years of recorded history and remained China's cultural, economic and political center until approximately 1,000 years ago. Henan Province is home to many heritage sites, including the ruins of Shang dynasty capital city Yin and the Shaolin Temple. Four of the Eight Great Ancient Capitals of China, Luoyang, Anyang, Kaifeng and Zhengzhou, are in Henan. The practice of tai chi also began here in Chen Jia Gou Village (Chen style), as did the later Yang and Wu styles. Although the name of the province () means "south of the ellowriver.", approximately a quarter of the province lies north of the Yellow River, also known as the Hu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dominance (genetics)
In genetics, dominance is the phenomenon of one variant (allele) of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome. The first variant is termed dominant and the second recessive. This state of having two different variants of the same gene on each chromosome is originally caused by a mutation in one of the genes, either new (''de novo'') or inherited. The terms autosomal dominant or autosomal recessive are used to describe gene variants on non-sex chromosomes ( autosomes) and their associated traits, while those on sex chromosomes (allosomes) are termed X-linked dominant, X-linked recessive or Y-linked; these have an inheritance and presentation pattern that depends on the sex of both the parent and the child (see Sex linkage). Since there is only one copy of the Y chromosome, Y-linked traits cannot be dominant or recessive. Additionally, there are other forms of dominance such as incomplete d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mongolian Spot
A Mongolian spot, also known as slate grey nevus or congenital dermal melanocytosis, is a benign, flat, congenital birthmark with wavy borders and an irregular shape. In 1883, it was described and named after Mongolians by Erwin Bälz, a German anthropologist based in Japan, who erroneously believed it to be most prevalent among his Mongolian patients. It normally disappears three to five years after birth and almost always by puberty. The most common color is blue, although they can be blue-gray, blue-black or deep brown. Cause Mongolian spot is a congenital developmental condition—that is, one existing from birth—exclusively involving the skin. The blue colour is caused by melanocytes, melanin-containing cells, that are usually located in the surface of the skin (the epidermis), but are in the deeper region (the dermis) in the location of the spot. Usually, as multiple spots or one large patch, it covers one or more of the lumbosacral area (lower back), the buttocks, sides ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epicanthal Fold
An epicanthic fold or epicanthus is a skin fold of the upper eyelid that covers the inner corner (medial canthus) of the eye. However, variation occurs in the nature of this feature and the possession of "partial epicanthic folds" or "slight epicanthic folds" is noted in the relevant literature.Lang, Berel (ed.) (2000) ''Race and Racism in Theory and Practice'', Rowman & Littlefield, p. 10 Various factors influence whether epicanthic folds form, including ancestry, age, and certain medical conditions. Etymology ''Epicanthus'' means 'above the canthus', with epi-canthus being the Latinized form of the Ancient Greek : 'corner of the eye'. Classification Variation in the shape of the epicanthic fold has led to four types being recognised: * ''Epicanthus supraciliaris'' runs from the brow, curving downwards towards the lachrymal sac. * ''Epicanthus palpebralis'' begins above the upper tarsus and extends to the inferior orbital rim. * ''Epicanthus tarsalis'' originates at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Congenital Malformations Of The Dermatoglyphs
Congenital malformations of the dermatoglyphs are a cutaneous condition divided into four main categories based on the appearance of the dermal ridges of which they are composed: (1) ridge aplasia; (2) ridge hypoplasia; (3) ridge dissociation; and (4) ridges-off-the-end. See also * Melanotic neuroectodermal tumor of infancy * List of cutaneous conditions Many skin conditions affect the human integumentary system—the organ system covering the entire surface of the body and composed of skin, hair, nails, and related muscle and glands. The major function of this system is as a barrier against t ... References External links Cutaneous congenital anomalies {{Dermatology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
