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Population structure (genetics) Population structure (also called genetic structure and population stratification) is the presence of a systematic difference in allele frequencies between subpopulations. In a randomly mating (or panmictic) population, allele frequencies are expected to be roughly similar between groups.
Population size. In population genetics and population ecology, population size (usually denoted N) is a countable quantity representing the number of individual organisms in a population. Population size is directly associated with amount of genetic drift, and is the underlying cause of effects like population bottlenecks and the founder ...
Population. Population is the term typically used to refer to the number of people in a single area. Governments conduct a census to quantify the size of a resident population within a given jurisdiction. The term is also applied to non-human animals, microorganisms, and plants, and has specific uses within such fields as ecology and genetics .
Genographic Project. ISOGG. v. t. e. Population genetics is a subfield of genetics that deals with genetic differences within and among populations, and is a part of evolutionary biology. Studies in this branch of biology examine such phenomena as adaptation, speciation, and population structure. [1] Population genetics was a vital ingredient ...
By 2055, the breakdown is estimated to be 48% non-Hispanic white, 24% Hispanic, 16% Black, and 14% Asian. [185] As of 2015, 14% of the United States' population is foreign born, compared to just 5% in 1965. Nearly 39 million immigrants have come to the U.S. since 1965, with most coming from Asia and Latin America.
Genetic assignment methods. Genetic assignment methods are a set of powerful statistical methods that are used to determine the relationship between individuals and populations. [1] The general principle behind them is to use multilocus genotypes to assign reference populations as origins of the individuals. [2]
The 17,821,419 million Dutch inhabitants are concentrated on an area of 41,543 km 2 (16,040 sq mi) including water surface, the land surface being 33,895 km 2 (13,087 sq mi). This means that the country has a population density of 526/km 2 (1,360/sq mi). The density of 500 inhabitants/km 2 was reached in the first half of 2014.
The effective population size ( Ne) is size of an idealised population would experience the same rate of genetic drift or increase in inbreeding as in the real population. Idealised populations are based on unrealistic but convenient assumptions including random mating, simultaneous birth of each new generation, constant population size.