0_Wizard
 Red hair occurs naturally in 1–2% of the human population.
Red hair (or ginger hair) occurs naturally in 1–2% of the human population.
chosen_Red_hair_0
Red hair
chosen_topic_0_Red_hair
Red hair
Red hair (or ginger hair) occurs naturally in 1–2% of the human population. It occurs more frequently (2–6%) in people of northern or western European ancestry, and less frequently in other populations. Red hair appears most commonly in people with two copies of a recessive allele on chromosome 16 which produces an altered version of the MC1R protein. Red hair varies in hues from a deep burgundy or bright copper (reddish-brown or auburn) through to burnt orange or red-orange and strawberry blond. It is characterized by high levels of the reddish pigment pheomelanin and relatively low levels of the dark pigment eumelanin.
Red
Red is the colour at the end of the visible spectrum of light, next to orange and opposite violet. It has a dominant wavelength of approximately 625–740 nanometres. It is a primary color in the RGB color model and the CMYK color model, and is the complementary color of cyan. Reds range from the brilliant yellow-tinged scarlet and vermillion to bluish-red crimson, and vary in shade from the pale red pink to the dark red burgundy. The red sky at sunset results from Rayleigh scattering, while the red color of the Grand Canyon and other geological features is caused by hematite or red ochre, both forms of iron oxide.
Human hair color
Hair color is the pigmentation of hair follicles due to two types of melanin: eumelanin and pheomelanin. Generally, if more eumelanin is present, the color of the hair is darker; if less eumelanin is present, the hair is lighter. The darker a person's natural hair color is, the more individual hair follicles they have on their scalp. Levels of melanin can vary over time causing a person's hair color to change, and it is possible to have hair follicles of more than one color on the same person. Particular hair colors are associated with ethnic groups. Gray or white hair is associated with age. The Fischer–Saller scale, named after Eugen Fischer and , is used in physical anthropology and medicine to determine the shades of hair color.
Hair
Hair is a protein filament that grows from follicles found in the dermis. Hair is one of the defining characteristics of mammals. The human body, apart from areas of glabrous skin, is covered in follicles which produce thick terminal and fine vellus hair. Most common interest in hair is focused on hair growth, hair types and hair care, but hair is also an important biomaterial primarily composed of protein, notably alpha-keratin. Attitudes towards different hair, such as hairstyles and hair removal, vary widely across different cultures and historical periods, but it is often used to indicate a person's personal beliefs or social position, such as their age, sex, or religion.
Human
Modern humans ("Homo sapiens", ssp. "Homo sapiens sapiens") are the only extant members of the subtribe Hominina, a branch of the tribe Hominini belonging to the family of great apes. They are characterized by erect posture and bipedal locomotion; high manual dexterity and heavy tool use compared to other animals; and a general trend toward larger, more complex brains and societies. Early hominins—particularly the australopithecines, whose brains and anatomy are in many ways more similar to ancestral non-human apes—are less often referred to as "human" than hominins of the genus "Homo". Several of these hominins used fire, occupied much of Eurasia, and gave rise to anatomically modern "Homo sapiens" in Africa about 315,000 years ago.
Auburn hair
Auburn hair is a variety of red hair, most commonly described as reddish-brown in color or dark ginger. Auburn hair ranges in shades from medium to dark. It can be found with a wide array of skin tones and eye colors, but as is the case with most red hair, it is commonly associated with light skin features. The chemical pigments that cause the coloration of auburn hair are frequently pheomelanin with high levels of eumelanin; however, the auburn hair is due to a mutated melanocortin 1 receptor gene in the people of Northwestern European descent and by a mutated TYRP1 gene in the Austronesians, both genes that reduce the melanin production of the hair cells.
Human overpopulation
Human overpopulation (or population overshoot) occurs when the ecological footprint of a human population in a specific geographical location exceeds the carrying capacity of the place occupied by that group. Overpopulation can further be viewed, in a long term perspective, as existing if a population cannot be maintained given the rapid depletion of non-renewable resources or given the degradation of the capacity of the environment to give support to the population. Changes in lifestyle could reverse overpopulated status without a large population reduction. The term "human overpopulation" refers to the relationship between the entire human population and its environment: the Earth, or to smaller geographical areas such as countries.
1_Apprentice
That's interesting
0_Wizard
people of northern or western EuropeanPeople with European ancestry get it more than any other
It occurs more frequently (2–6%) in people of northern or western European ancestry, and less frequently in other populations.
chosen_Red_hair_0
Red hair
chosen_topic_0_Red_hair
White Brazilians
White Brazilians ( ) refers to Brazilian citizens of European or Levantine descent. According to the 2010 Census, they totaled 91,051,646 people, and made up 47.73% of the Brazilian population. The main ancestry of white Brazilians is Portuguese, followed by Italian, Spanish, German, and other German-speaking nationalities (Austrian, Swiss, Luxembourger and Volga German) Slavic (Polish, Ukrainian, Russian etc), Levantine, Dutch, French and Baltic. The white Brazilian population is spread throughout the national territory, but its highest percentage is found in the three southernmost states, where 79.8% of the population has European or Caucasian phenotype, whereas the Southeast region has the largest absolute numbers.
Afro-Brazilians
Afro-Brazilians (; ) is a term used in the 21st century by some in Brazil to refer to Brazilian people with African ancestry. The term does not have widespread use in Brazil, where social constructs and classifications have been based on appearance. People with noticeable African features and skin color are generally referred to (and they identify) as "negro" or "preto" ("black"). Many members of another group of people, multiracial Brazilians, or "pardos", also have a range of degree of African ancestry. Preto and pardo are among five color categories used by the Brazilian Census, along with "branco" ("white"), "amarelo" ("yellow", East Asian) and "indígena" (Amerindian).
White Latin Americans
White Latin Americans or European Latin Americans are Latin Americans who are considered white, typically due to European, or in some cases Levantine, descent. Latin American countries have often encouraged miscegenation, and even a small amount of European ancestry could entail significant upwards social mobility. People descended from European settlers who arrived in the Americas during the colonial and post-independence periods can be found throughout Latin America. Most of the earliest settlers were Spanish and Portuguese; after independence, the most numerous immigrants have been Spanish and Italians, followed by Germans, Levantine Semites, Poles, Irish, British, French, Russians, Belgians, Dutch, Scandinavians, Ukrainians, Hungarians, Croats, Swiss, Greeks, and other Europeans.
White people
White people is a racial classification specifier, used for people of Caucasian ancestry, with the exact implications dependent on context. The usage of "white people" or a "white race" for a large group of (mainly European) populations, defined besides other characteristics by their light skin and contrasting with "black people", Native Americans, "colored" or "persons of color" originated in the 17th century. It was only during the 18th century, that this floating category was transformed in a quasi-scientific system of race and skin color relations. The concept of a homogeneous white race did not achieve universal acceptance in Europe.
Multiracial Americans
Multiracial Americans are Americans who have mixed ancestry of "two or more races". The term may also include Americans of mixed-race ancestry who self-identify with just one group culturally and socially (cf. the one-drop rule). In the 2010 US census, approximately 9 million individuals, or 2.9% of the population, self-identified as multiracial. There is evidence that an accounting by genetic ancestry would produce a higher number. Historical reasons, including slavery creating a racial caste and the European-American suppression of Native Americans, often led people to identify or be classified by only one ethnicity, generally that of the culture in which they were raised.
Eurasian (mixed ancestry)
A Eurasian is a person of mixed Asian and European ancestry. The term was originally coined in 19th-century British India to identify a person born to (usually) a British father and an Indian mother. These mixed offspring were later called Anglo-Indians. In addition to British many were also of mixed Portuguese, Dutch, Indian, or, more rarely, French descent. The term has now been extended to include people whose parentage hails from Europe and all of Asia. The term has been used in anthropological literature since the 1960s. Historically, Central Asia has been a "melting pot" of West Eurasia and East Eurasian peoples, leading to high genetic admixture and diversity.
Mixed-race Brazilian
Brazilian censuses do not use a "multiracial" category. Instead, the censuses use skin colour categories. Most Brazilians of visibly mixed racial origins self-identify as pardos. However, many white Brazilians have distant non-white ancestry, while the group known as pardos, likely contains non-mixed acculturated Amerindians. According to the 2010 census, "pardos" make up 82.277 million people, or 43.13% of Brazil's population. According to some DNA researches, Brazilians "predominantly" possess some degree of mixed-race ancestry, though less than half of the country's population classified themselves as "pardos" in the census.
1_Apprentice
Is Red hair same as blond?
0_Wizard
Red hair appears most commonly in people with two copies of a recessive allele on chromosome 16
Red hair appears most commonly in people with two copies of a recessive allele on chromosome 16 which produces an altered version of the MC1R protein.
chosen_Red_hair_0
Red hair
chosen_topic_0_Red_hair
Red hair
Red hair (or ginger hair) occurs naturally in 1–2% of the human population. It occurs more frequently (2–6%) in people of northern or western European ancestry, and less frequently in other populations. Red hair appears most commonly in people with two copies of a recessive allele on chromosome 16 which produces an altered version of the MC1R protein. Red hair varies in hues from a deep burgundy or bright copper (reddish-brown or auburn) through to burnt orange or red-orange and strawberry blond. It is characterized by high levels of the reddish pigment pheomelanin and relatively low levels of the dark pigment eumelanin.
Dominance (genetics)
Dominance in genetics is a relationship between alleles of one gene, in which the effect on phenotype of one allele masks the contribution of a second allele at the same locus. The first allele is dominant and the second allele is recessive. For genes on an autosome (any chromosome other than a sex chromosome), the alleles and their associated traits are autosomal dominant or autosomal recessive. Dominance is a key concept in Mendelian inheritance and classical genetics. Often the dominant allele codes for a functional protein whereas the recessive allele does not. A classic example of dominance is the inheritance of seed shape in peas.
Introduction to genetics
Genetics is the study of genes—what they are, what they do, and how they work. Genes inside the nucleus of a cell are strung together in such a way that the sequence carries information: that information determines how living organisms inherit various features (phenotypic traits). For example, offspring produced by sexual reproduction usually look similar to each of their parents because they have inherited some of each of their parents' genes. Genetics identifies which features are inherited, and explains how these features pass from generation to generation. In addition to inheritance, genetics studies how genes are turned on and off to control what substances are made in a cell—gene expression; and how a cell divides—mitosis or meiosis.
Zygosity
Zygosity is the degree of similarity of the alleles for a trait in an organism. Most eukaryotes have two matching sets of chromosomes; that is, they are diploid. Diploid organisms have the same loci on each of their two sets of homologous chromosomes except that the sequences at these loci may differ between the two chromosomes in a matching pair and that a few chromosomes may be mismatched as part of a chromosomal sex-determination system. If both alleles of a diploid organism are the same, the organism is homozygous at that locus. If they are different, the organism is heterozygous at that locus.
Human hair color
Hair color is the pigmentation of hair follicles due to two types of melanin: eumelanin and pheomelanin. Generally, if more eumelanin is present, the color of the hair is darker; if less eumelanin is present, the hair is lighter. The darker a person's natural hair color is, the more individual hair follicles they have on their scalp. Levels of melanin can vary over time causing a person's hair color to change, and it is possible to have hair follicles of more than one color on the same person. Particular hair colors are associated with ethnic groups. Gray or white hair is associated with age. The Fischer–Saller scale, named after Eugen Fischer and , is used in physical anthropology and medicine to determine the shades of hair color.
Mendelian inheritance
Mendelian inheritance is a type of biological inheritance that follows the laws originally proposed by Gregor Mendel in 1865 and 1866 and re-discovered in 1900. These laws 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.
Solid white (chicken plumage)
In poultry standards, solid white is coloration of plumage in chickens ("Gallus gallus domesticus") characterized by a uniform pure white color across all feathers, which is not generally associated with depigmentation in any other part of the body. Color is an important feature of most living organisms. In the wild, color has great significance affecting the survival and reproductive success of the species. The environmental constraints which lead to the specific colors of birds and animals are very strong and individuals of novel colors tend not to survive. Under domestication, mankind has transformed all the species involved which have thus been freed from environmental pressures to a large extent.
1_Apprentice
What else can you tell me about red hair?