PERMANENCY OF RESPONSE TO SELECTION FOR QUANTITATIVE CHARACTERS IN FINITE POPULATIONS
PERMANENCY OF RESPONSE TO SELECTION FOR QUANTITATIVE CHARACTERS IN FINITE POPULATIONS
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DOI：
10.1073/pnas.85.5.1563
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发表时间：
1988-03-01
影响因子：
11.1
通讯作者：
TACHIDA, H
中科院分区：
文献类型：
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作者：
COCKERHAM, CC;TACHIDA, H
为了研究有限种群中数量性状对选择反应的持久性以及导致这种反应的遗传效应的性质，我们使用了种群内祖先和后代之间的协方差。定义了初始平衡随机交配的雌雄同株种群产生复制有限种群的效应和方差。在限定种群规模的规定历史之后，重复种群被扩大，祖先和后代之间的协方差在初始种群中被量化，作为确定种群内加性方差的一种手段。包括位点联合显性效应在内的几个显性成分对加性方差有贡献，其中一些可能是负的。在种群内，可加性方差对可加性方差的贡献总是正的，而且可能很大。在种群内遗传变异成分的新定义下，选择反应的表述方式与初始随机交配群体相同，但这些成分已被限定种群位点大大修改。
To study the permanency of response to selection for a quantitative character in finite populations and the nature of the genetic effects that contribute to this response, we have used to covariance between ancestors and descendants within populations. Effects and variances are defined for an initial equilibrium random mating monoecious population that gives rise to replicate finite populations. After a prescribed history of restricted population size, the replicate populations are expanded, and the covariance between ancestors and descendants is quantified in terms of descent measures and genetic components in the initial population as a means of determining the additive variance within populations. Several dominance components including joint dominance effects of loci contribute to the additive variance, some of which can be negative. There is always a positive contribution of additive by additive variance to the additive variance within populations, which can be large. With the new definitions of components of genetic variance within populations, selection response is formulated in the same manner as for the initial random mating population, but the components have been modified considerably by the restricted population site.