Maintenance of genetic variability under strong stabilizing selection: a two-locus model.
Maintenance of genetic variability under strong stabilizing selection: a two-locus model.
复制标题
在强稳定选择下维持遗传变异:双基因座模型。
DOI:
10.1093/genetics/134.1.377
复制
发表时间:
1993
期刊:
影响因子:
3.3
通讯作者:
Hastings,A
中科院分区:
文献类型:
--
作者:
Gavrilets,S;Hastings,A
We study a two locus model with additive contributions to the phenotype to explore the relationship between stabilizing selection and recombination. We show that if the double heterozygote has the optimum phenotype and the contributions of the loci to the trait are different, then any symmetric stabilizing selection fitness function can maintain genetic variability provided selection is sufficiently strong relative to linkage. We present results of a detailed analysis of the quadratic fitness function which show that selection need not be extremely strong relative to recombination for the polymorphic equilibria to be stable. At these polymorphic equilibria the mean value of the trait, in general, is not equal to the optimum phenotype, there exists a large level of negative linkage disequilibrium which "hides" additive genetic variance, and different equilibria can be stable simultaneously. We analyze dependence of different characteristics of these equilibria on the location of optimum phenotype, on the difference in allelic effect, and on the strength of selection relative to recombination. Our overall result that stabilizing selection does not necessarily eliminate genetic variability is compatible with some experimental results where the lines subject to strong stabilizing selection did not have significant reductions in genetic variability.
登录
查看更多内容
影响因子:
1.9
作者:
GAVRILETS, S
通讯作者:
GAVRILETS, S
影响因子:
1.5
作者:
T. Prout
通讯作者:
T. Prout
DOI:
10.1073/pnas.45.7.989
发表时间:
1959
影响因子:
11.1
作者:
K. Kojima
通讯作者:
K. Kojima
影响因子:
3.3
作者:
T. Nagylaki
通讯作者:
T. Nagylaki
影响因子:
3.3
作者:
A. Hastings;C. Hom
通讯作者:
C. Hom