Arabs (/ˈærəbz/; Arabic:عرب, ‘arab) are a major panethnic group whose native language is Arabic, comprising the majority of the Arab world. They primarily inhabit Western Asia, North Africa, and parts of the Horn of Africa. Before the spread of Islam, Arab referred to any of the largely nomadic Semitic tribes inhabiting the northern and central Arabian Peninsula. In modern usage Arab refers to a heterogeneous collection of Arabic-speaking peoples in the Middle East and North Africa. The ties that bind Arabs are linguistic, cultural, and political, and to a lesser extent genetic, with Arabized Arabs displaying genetic admixture from the Arabian peninsula as well as indigenous elements. As such, Arab identity is based on one or more of genealogical, linguistic or cultural grounds, although with competing identities often taking a more prominent role, based on considerations including regional, national, clan, kin, sect, and tribe affiliations and relationships. Not all people who could be considered Arab identify as such. If the Arab panethnicity is regarded as a single population, then it constitutes the world's second largest group of people after the Han Chinese.
A population is a summation of all the organisms of the same group or species, which live in a particular geographical area, and have the capability of interbreeding.
In ecology, the population of a certain species in a certain area is estimated using the Lincoln Index. The area that is used to define a sexual population is defined as the area where inter-breeding is potentially possible between any pair within the area. The probability of interbreeding is greater than the probability of cross-breeding with individuals from other areas. Under normal conditions, breeding is substantially more common within the area than across the border.
In sociology, population refers to a collection of humans. Demography is a social science which entails the statistical study of human populations. This article refers mainly to human population.
Population genetics (ecology)
In population genetics a sexual population is a set of organisms in which any pair of members can breed together. This means that they can regularly exchange gametes to produce normally-fertile offspring, and such a breeding group is also known therefore as a gamodeme. This also implies that all members belong to the same of species, such as humans.
If the gamodeme is very large (theoretically, approaching infinity), and all gene alleles are uniformly distributed by the gametes within it, the gamodeme is said to be panmictic. Under this state, allele (gamete) frequencies can be converted to genotype (zygote) frequencies by expanding an appropriate quadratic equation, as shown by Sir Ronald Fisher in his establishment of quantitative genetics.
To the editor. ... This event took place several months ago to raise the awareness of the homeless teen population in the valley and to get the conversation started amongst those who have a passion for the issue ... Steven Cameron. Berlin ... North Conway .......
Iceland's population of only about 340,000; some of its national team members earning their living by doing other jobs; and the country's low average temperature not being ideal for playing soccer. In contrast, China has a population of more than 1.3 billion; Chinese players' incomes, mainly from their clubs, can be compared with some of the top ......