The infinitesimal model
The infinitesimal model
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无穷小模型
DOI:
10.1101/039768
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Barton N
中科院分区:
文献类型:
--
作者:
Barton N
Our focus here is on the infinitesimal model. In this model, one or several quantitative traits are described as the sum of a genetic and a non-genetic component, the first being distributed as a normal random variable centred at the average of the parental genetic components, and with a variance independent of the parental traits. We first review the long history of the infinitesimal model in quantitative genetics. Then we provide a definition of the model at the phenotypic level in terms of individual trait values and relationships between individuals, but including different evolutionary processes: genetic drift, recombination, selection, mutation, population structure,… We give a range of examples of its application to evolutionary questions related to stabilising selection, assortative mating, effective population size and response to selection, habitat preference and speciation. We provide a mathematical justification of the model as the limit as the number M of underlying loci tends to infinity of a model with Mendelian inheritance, mutation and environmental noise, when the genetic component of the trait is purely additive. We also show how the model generalises to include epistatic effects. In each case, by conditioning on the pedigree relating individuals in the population, we incorporate arbitrary selection and population structure. We suppose that we can observe the pedigree up to the present generation, together with all the ancestral traits, and we show, in particular, that the genetic components of the individual trait values in the current generation are indeed normally distributed with a variance independent of ancestral traits, up to an error of order. Simulations suggest that in particular cases the convergence may be as fast as 1/M.
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DOI:
10.1111/j.0014-3820.2005.tb01771.x
发表时间:
2005
期刊:
The British Journal for the History of Science
影响因子:
--
作者:
J. Polechová;N. Barton
通讯作者:
N. Barton
DOI:
10.1098/rsta.1901.0020
发表时间:
1901-12-01
影响因子:
--
作者:
Pearson, K;Lee, A;Fawcett, CD
通讯作者:
Fawcett, CD
DOI:
--
发表时间:
1935
期刊:
Journal Genetika
影响因子:
--
作者:
S. Wright
通讯作者:
S. Wright
影响因子:
3.3
作者:
Weber,KE;Diggins,LT
通讯作者:
Diggins,LT
影响因子:
64.8
作者:
A. S. Davis
通讯作者:
A. S. Davis