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Impact of nonrandom mating on genetic variance and gene flow in populations with mass selection.

机译:质量选择群体中非随机交配对遗传变异和基因流的影响。

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摘要

The mechanisms by which nonrandom mating affects selected populations are not completely understood and remain a subject of scientific debate in the development of tractable predictors of population characteristics. The main objective of this study was to provide a predictive model for the genetic variance and covariance among mates for traits subjected to directional selection in populations with nonrandom mating based on the pedigree. Stochastic simulations were used to check the validity of this model. Our predictions indicate that the positive covariance among mates that is expected to result with preferential mating of relatives can be severely overpredicted from neutral expectations. The covariance expected from neutral theory is offset by an opposing covariance between the genetic mean of an individual's family and the Mendelian sampling term of its mate. This mechanism was able to predict the reduction in covariance among mates that we observed in the simulated populations and, in consequence, the equilibrium genetic variance and expected long-term genetic contributions. Additionally, this study provided confirmatory evidence on the postulated relationships of long-term genetic contributions with both the rate of genetic gain and the rate of inbreeding (deltaF) with nonrandom mating. The coefficient of variation of the expected gene flow among individuals and deltaF was sensitive to nonrandom mating when heritability was low, but less so as heritability increased, and the theory developed in the study was sufficient to explain this phenomenon.
机译:尚未完全了解非随机交配影响选定人群的机制,并且在制定易于预测的人口特征预测因子中仍然是科学辩论的主题。这项研究的主要目的是为基于系谱的非随机交配群体中定向选择的性状的配偶之间的遗传方差和协方差提供一个预测模型。随机模拟用于检查该模型的有效性。我们的预测表明,中性预期可能严重高估了预期因亲戚优先交配而导致的配偶之间的正协方差。中立理论期望的协方差被个体家庭的遗传均值与其伴侣的孟德尔抽样项之间的相反协方差所抵消。这种机制能够预测我们在模拟种群中观察到的配偶之间协方差的减少,从而可以预测平衡遗传方差和预期的长期遗传贡献。此外,这项研究为长期遗传贡献与非随机交配的遗传增益和近交率(deltaF)的假定关系提供了验证性证据。当遗传力较低时,个体之间的预期基因流和deltaF的变异系数对非随机交配敏感,但随着遗传力增加,变异系数变小,因此研究中发展的理论足以解释这种现象。

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