Charlesworth D, Charlesworth B
Department of Ecology and Evolution, University of Chicago, 1101 East 57th Street, Chicago, Illinois, 60637-1573.
Evolution. 1995 Oct;49(5):911-920. doi: 10.1111/j.1558-5646.1995.tb02326.x.
The expected effects of breeding system on quantitative genetic variation under various models for the maintenance of such variation are examined, with particular emphasis on the contrast between randomly mating and highly self-fertilizing populations. Estimates of quantitative genetic parameters from plant populations are reviewed. There is some evidence for reduced within-population genetic variance in highly inbreeding populations, compared with outbreeders, but more empirical work appears necessary. Although the estimate of the magnitude of the effect of breeding system is subject to considerable error, the reduction in genetic variance in inbreeding populations appears greater than expected if the variation were maintained by overdominance, or if it were due to neutral mutations. It is more consistent with models involving mutation-selection balance, although a rather larger reduction in genetic variance is estimated than is expected theoretically. We discuss some possible reasons for the lower level of genetic variance in selfers than is predicted by such models.
研究了在维持数量遗传变异的各种模型下，繁育系统对数量遗传变异的预期影响，特别强调了随机交配群体和高度自交群体之间的对比。回顾了来自植物群体的数量遗传参数估计值。有一些证据表明，与远交群体相比，高度自交群体的群体内遗传方差有所降低，但似乎需要更多的实证研究。尽管繁育系统效应大小的估计存在相当大的误差，但如果变异是由超显性维持的，或者是由中性突变导致的，那么自交群体中遗传方差的降低似乎比预期的要大。这与涉及突变 - 选择平衡的模型更为一致，尽管估计的遗传方差降低幅度比理论预期的要大一些。我们讨论了自交群体中遗传方差水平低于此类模型预测值的一些可能原因。
