نتایج جستجو برای: founder effect

تعداد نتایج: 1647862  

Journal: :American journal of physical anthropology 1969
F B Livingstone

During the rapid growth of a population from a few founders, a single deleterious gene in a founder can attain an appreciable frequency in later generations. A computer simulation, which has the population double itself in early generations, indicates a lethal could attain a frequency of 0.1. Since deleterious recessive genes are eliminated from large populations at a very slow rate, variations...

Journal: :Genetics 1980
A R Templeton

The founder principle has been used to explain many instances of rapid speciation. Advances from theoretical population genetics are incorporated into MAYR's original founder-effect genetic-revolution model to yield a newer model called the genetic transilience. The basic theoretical edifice lies upon the fact that founder event can sometimes lead to an accumulation of inbreeding and an inducti...

Journal: :Human mutation 2015
Hicham Charoute Amina Bakhchane Houda Benrahma Lilia Romdhane Khalid Gabi Hassan Rouba Malika Fakiri Sonia Abdelhak Guy Lenaers Abdelhamid Barakat

The Mediterranean basin has been the theater of migration crossroads followed by settlement of several societies and cultures in prehistoric and historical times, with important consequences on genetic and genomic determinisms. Here, we present the Mediterranean Founder Mutation Database (MFMD), established to offer web-based access to founder mutation information in the Mediterranean populatio...

Journal: :Genetics and molecular research : GMR 2016
N P Pereira K C C Alevi J A Rosa M T V Azeredo-Oliveira

In this study, the karyometry of different Triatoma infestans populations from different states of Brazil was analyzed and compared with those of a population from Cochabamba. No significant differences were found between the population from Cochabamba and those from Brazil. These results are consistent with the origin of the T. infestans populations of Brazil by a founder effect from Cochabamb...

Journal: :Science 2011
Quentin D Atkinson

Human genetic and phenotypic diversity declines with distance from Africa, as predicted by a serial founder effect in which successive population bottlenecks during range expansion progressively reduce diversity, underpinning support for an African origin of modern humans. Recent work suggests that a similar founder effect may operate on human culture and language. Here I show that the number o...

Journal: :Current opinion in genetics & development 2016
Lauren Alpert Sugden Sohini Ramachandran

Human population genomic studies have repeatedly observed a decrease in heterozygosity and an increase in linkage disequilibrium with geographic distance from Africa. While multiple demographic models can generate these patterns, many studies invoke the serial founder effect model, in which populations expand from a single origin and each new population's founders represent a subset of genetic ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2002
Sonya M Clegg Sandie M Degnan Jiro Kikkawa Craig Moritz Arnaud Estoup Ian P F Owens

The importance of founder events in promoting evolutionary changes on islands has been a subject of long-running controversy. Resolution of this debate has been hindered by a lack of empirical evidence from naturally founded island populations. Here we undertake a genetic analysis of a series of historically documented, natural colonization events by the silvereye species-complex (Zosterops lat...

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