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What are the causes of the founder effect?
How does the founder effect impact the gene pool?
Is the founder effect always negative?
In population genetics, the founder effect is the loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population. It was first fully outlined by Ernst Mayr in 1942, [1] using existing theoretical work by those such as Sewall Wright. [2]
Apr 28, 2017 · Learn what the founder effect is and how it affects the genetic diversity of small populations. See examples of the founder effect in humans and animals, and how it differs from genetic drift.
Learn how genetic drift, a random change in allele frequencies, can affect evolution and population genetics. Explore the examples of bottleneck and founder effects, which occur when a population is reduced or isolated by chance events.
- Genetic drift is random and doesn't decrease the genetic diversity of a species. If anything it would increase the diversity since the genetic chan...
- Genetic drift is more common in smaller populations. Imagine an island where 5 white rabbits and 10 grey rabbits live. Perhaps grey rabbits have be...
- In the scenario of the asteroid causing a mass extinction, the asteroid wipes out many of the alleles present in the gene pool, regardless of wheth...
- No, it would be called founder effect if you isolated *only one* allele. From what we can see, again, all types of alleles are present (regardless...
- In small populations it is more likely that chance events will significantly change the frequencies of alleles in the population. For example: Imag...
- if the couple has several has several children, then all of them would carry the recessive allele. if the other couples have an average offspring c...
- but they would still be alive, and a smaller population means more resources for individuals. some creatures do not need to be in large groups to s...
- In that case, what has been labeled as 'beneficial' is no more beneficial and same applies for harmful alleles. New environment dictates new mutati...
- Comparing sickle cell phenotype to normal phenotype says that their survival is lower. I do not see how that phenotypic 'change' can increase fitne...
- Evolution doesn't go in a direction, it is a continuing process.
Founder effects. A founder effect occurs when a new colony is started by a few members of the original population. This small population size means that the colony may have: reduced genetic variation from the original population. a non-random sample of the genes in the original population.
6 days ago · A founder effect, as related to genetics, refers to the reduction in genomic variability that occurs when a small group of individuals becomes separated from a larger population. Over time, the resulting new subpopulation will have genotypes and physical traits resembling the initial small, separated group, and these may be very different from ...
Learn how random changes in trait frequency affect population genetics, and how small populations are more likely to experience genetic drift. See examples of bottleneck effect and founder effect, and how they differ from gene flow.
- 11 min
- Sal Khan
Feb 28, 2019 · The founder effect is a type of genetic drift that occurs when a small population with limited numbers of individuals breaks off from a larger population. Learn how the founder effect can increase the prevalence of inherited diseases and see examples from humans and animals.
