A general model of the relation between phenotypic selection and genetic response
A general model of the relation between phenotypic selection and genetic response
复制标题
表型选择与遗传反应之间关系的一般模型
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
G. Jong
中科院分区：
文献类型：
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作者：
P. H. Tienderen;G. Jong
选择的表型观点假设遗传反应可以从选择力和遗传力中预测-或者在经典的数量遗传方程中：R = h2S。然而，在鸟类种群的选择数据表明，往往没有选择反应，尽管一致的选择力的表型和显着的遗传变异。这种差异可能是由于假设选择只作用于观察到的表型。我们推导出一个一般的选择方程，考虑到一些相关的（内部或外部）性状没有测量的可能性。该方程表明，如果选择直接作用于测量的表型性状，则经典方程适用。例如，当存在未知的内部遗传权衡或未知的共同环境因素影响性状和适应性时，情况就不是这样了。在这种情况下，表型选择和遗传反应之间的任何关系都是可能的。幸运的是，经典模型可以通过比较性状和适合度之间的表型和遗传协方差来检验;因此可以获得重要的内部或外部性状缺失的指示。这样的分析确实在文献中找到;对于选择大山雀的雏鸟体重，它提供了有价值的额外信息。
The phenotypic view of selection assumes that genetic responses can be predicted from selective forces and heritability - or in the classical quantitative genetic equation: R = h2S. However, data on selection in bird populations show that often no selection response is found, despite consistent selective forces on phenotypes and significant heritable variation. Such discrepancies may arise due to the assumption that selection only acts on observed phenotypes. We derive a general selection equation that takes into account the possibility that some relevant (internal or external) traits are not measured. This equation shows that the classic equation applies if selection directly acts on the measured, phenotypic traits. This is not the case when, for instance, there are unknown internal genetic trade-offs, or unknown common environmental factors affecting both trait and fitness. In such cases, any relationship between phenotypic selection and genetic response is possible. Fortunately, the classical model can be tested by comparing phenotypic and genetic covariances between traits and fitness; an indication that important internal or external traits are missing can thus be obtained. Such an analysis was indeed found in the literature; for selection on fledging weight in Great Tits it yielded valuable extra information.