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Gene flow is the transfer of alleles from one population to another population through immigration of individuals. In population genetics, gene flow (also known as migration and allele flow) is the transfer of genetic material from one population to another. If the rate of gene flow is high enough, then two populations will have equivalent ...
Population bottleneck followed by recovery or extinction. A population bottleneck or genetic bottleneck is a sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts; or human activities such as genocide, speciocide, widespread violence or intentional culling.
Gene flow is hindered by mountain ranges, oceans and deserts or even human-made structures such as the Great Wall of China, which has hindered the flow of plant genes. [51] Gene flow is the exchange of genes between populations or species, breaking down the structure. Examples of gene flow within a species include the migration and then ...
Genetic pollution is a term for uncontrolled [1] [2] gene flow into wild populations. It is defined as "the dispersal of contaminated altered genes from genetically engineered organisms to natural organisms, esp. by cross-pollination", [3] but has come to be used in some broader ways.
The effect of this assortative mating is to reduce gene flow between geographical groups and to increase the genetic distance between groups. [ citation needed ] The expansion of humans from Africa affected the distribution of genetic variation in two other ways.
Gene flow, often by migration, is the movement of genetic material (for example by pollen in the wind, or the migration of a bird). Gene flow can introduce novel alleles to a population. These alleles can be integrated into the population, thus increasing genetic diversity. [20]
If you have an inherited intolerance to alcohol, a mutated gene could be the culprit. An at-home DNA test could detect whether you have the mutation, but doctors say there could be some drawbacks.
Population size, genetic diversity, and the environment can all affect the outcome. Isolation by distance (IBD), wherein population growth rates and immigration numbers are inversely proportional to population distance, may correlate gene flow patterns with geographic distance. Gene flow may also follow patterns of isolation by habitat, with ...