A change in the population allele frequency that occurs when a subpopulation is established by a small number of individuals. The change occurs only by chance because the members of the new population are a random subsample that may deviate from the overall allele frequencies. Such changes are stronger in smaller founder populations, given the higher sampling variance.
Changes in gene frequency that occur when a few individuals from a parental population colonize new habitats; the change is a result of founding individuals not having a representative sample of the parental population's genes.
A form of genetic drift caused by a particular founder being more frequently an ancestor of members of the present population than are other founders, resulting in a higher frequency in the population of the alleles carried by that founder.
a local morphological variation caused when colonies form from a small number of individuals which have only a restricted set of the genes found in the entire population
Evolution of a closely-related population in a geographical region following the initial introduction of a "founder" pathogen (such as a virus which has been carried there by a human host).
when the founders of a new population or a population sample do not represent the total genetic variability contained in the parent population.
Genetic drift when small groups found new settlements, partitioning a subset of the original population's genes. 408
a form of -- genetic drift that occurs when a small breeding unit has formed by-- migration of a small number of individuals from a large population. The genetic composition of the founders may not be representative of the composition of the source population, and small -- effective population size during the first generations following the founder event further leads to strong genetic drift. This results in genetic divergence of the founded population relative to the source population. See -- bottleneck.
The effect on a specific population due to the genes or marker values of a single individual (founder).
changes in allele frequencies that occur when a subpopulation is formed from a larger one. Typically many rare and usually undesirable alleles are excluded while a few carried by the founders get a big boost in frequency.
The difference in gene pools between an original population and a new population founded by one or a few individuals randomly separated from the original population, as when an island population is founded by one or a few individuals; often accentuates genetic drift.
the change in gene frequency occurring when a population is based on only a few individuals.
A phenomenon that is observed when a small subgroup of a larger POPULATION establishes itself as a separate and isolated entity. The subgroup's GENE POOL carries only a fraction of the genetic diversity of the parental population resulting in an increased frequency of certain diseases in the subgroup, especially those diseases known to be autosomal recessive.
when a particular gene mutation is present in a population at increased frequency because it was present in a small isolated group of “founders," ancestors who gave rise to most of the individuals in the present day population.
A gene mutation observed in high frequency in a specific population due to the presence of that gene mutation in a single ancestor or small number of ancestors Related Terms: allele frequency ; population risk
A cause of genetic drift attributable to colonization by a limited number of individuals from a parent population.
the principle that when a small sample of a larger population establishes itself as a newly isolated entity, its gene pool carries only a fraction of the genetic diversity represented in the parental population
Change in gene frequency that occurs in a small isolated population derived from a large population (genetic drift).
phenomenon through which newly established populations are more representative of their founders than of the population from which the founders came. See also Genetic drift.
The principle that the founders of a new colony carry only a fraction of the total genetic variation of the source population.
Certain genetic disorders can be relatively common in particular populations through all individuals being descended from a relatively small number of ancestors, one or a few of whom had a particular disorder.