founder effect

(redirected from Founder event)
Also found in: Medical, Encyclopedia.
Related to Founder event: Founder principle, Founder population

founder effect

n.
A random difference in allele frequencies of a population founded by a small group of organisms relative to the allele frequencies in the original population.
References in periodicals archive ?
More shared sequences indicated a stronger founder event.
There is surprisingly little evidence for any significant founder event from the Near East," the paper says.
It's a three-day competition which is an R&A World Amateur Golf Ranking tournament, used for Great Britain & Ireland team selection and a founder event in the English Golf Union Boys Order of Merit.
This collection of articles and photographs gives managers a good idea of recent research into what the sockeye salmon is and does, covering such topics as the vulnerability and value of sockeye salmon ecotypes, their homing ability, using new technologies to monitor reproduction, DNA and a founder event in the Lake Clark sockeye salmon, marine-derived nutrients, the exploitation of large prey, dynamic lake spawning migrations by females, variability of sockeye salmon residence, expression profiling using cDNA microarray technology, learning from stable isotropic records of native otolith hatcheries, the amount of data needed to manage sockeye salmon and estimating salmon "escapement.
Sales figures for the entire project now equal $130 million (US) to date, including $72 million sold at the founder event in May 2002.
In order for founder effect speciation models to produce adaptive evolutionary change and speciation, the founder event must cause a large change in the genetic environment through drift or increased inbreeding but at the same time allow sufficient additive genetic variation for a significant evolutionary response to the altered genetic and external environment (Templeton 1980a, b).
Genetic revolution occurs after an extreme founder event and subsequent small population size has eroded virtually all genetic variability from the founding population's gene pool.
On the basis of reproductive isolation tests, it has been suggested that speciation occurred in the Lab population following the founder event (Weinberg et al.
A founder event and subsequent inbreeding can lead to the random loss of genetic variation and altered gene complexes.
These papers do share at least one attribute; they all assume that the amount of genetic variance in a population after a bottleneck or founder event is slightly less than in the outbred source population.
It is more difficult to assess the effect of a founder event on the expected heritability than on the expected additive variance, because allele-frequency changes caused by genetic drift will alter both the total genetic variance and the additive variance.
Thus, each cycle starts with a founder event, where the number of founder pairs, n, ranges from one to nine.