founder effect

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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
In doing this, you've artificially created a founder event, where a small subset of the original population has formed a new population.
"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."
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).
Speciation via host shifts or founder event should result in significantly lower levels of genetic variation in populations infesting the derived host because of founder effect (Harrison 1991).
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.
The Lab population is genetically depauperate, most likely as a consequence of the founder event, but this reduced variability contributes only trivially (about 1%) to the genetic differentiation between the populations.
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.