The joint effects of selection and assortative mating on a single polygenic character
The joint effects of selection and assortative mating on a single polygenic character
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选择和选型交配对单个多基因性状的联合影响
DOI：
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发表时间：
2004
影响因子：
5.4
通讯作者：
P. Leppard
中科院分区：
文献类型：
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作者：
G. M. Tallis;P. Leppard
在以前的两篇论文（Tallis 1985，1987）中，研究了选择性交配（“选择”）和选择对加性遗传方差和协方差的影响。这些论点足够通用，可以同时处理几个字符。这是本文的目的，以扩展这项工作，通过开发的结果，使联合效应的基因型和表型方差的选择和消除进行评估。额外的分析还检查遗传增益和最重要的亲属之间的协方差的影响。只处理单个字符，因为这是主要兴趣的情况。这使得开发变得简单，并有助于展示想法和结果。多个字符的处理将在随后的论文中介绍。这样的研究之所以重要，至少有两个原因：（1）能够评估选择和繁殖对遗传增益的联合数值效应是有用的--如果遗传增益的增加是微不足道的，那么在选择后再进行额外的交配是没有意义的;以及（2）可能需要估计来自经历一种或两种过程的群体的全混群、表型和遗传方差。这种计算首先由Fisher（1918）进行，步骤由Crow和Kimura（1970）给出。费希尔指出，对男性身高遗传力的估计需要校正父母之间的正向回归，以使其减少到一个全交配当量。符号和基本结果
In two previous papers (Tallis 1985, 1987), the effects of assortative mating ("assortation") and selection on additive genetic variances and covariances were examined. The arguments were sufficiently gneral to allow for the simultaneous treatment of several characters. It is the purpose of this paper to extend this work by developing results which allow the joint effects of selection and assortation on genotypic and phenotypic variances to be assessed. Additional analyses also examine effects on genetic gains and on the covariances between the most important relatives. Only a single character is treated, since it is the case of prime interest. This allows the development to be simple and assists the display of ideas and results. The treatment of multiple characters is covered in a subsequent paper. Studies such as these are important for at least two reasons: (1) it is useful to be able to assess the joint numerical effects of selection and assortation on genetic gains there is no point in making the extra effort to mate assortatively after selection if the increase in genetic gains will be marginal; and (2) it may be required to estimate panmictic, phenotypie, and genetic variances from a population subjected to one or both o f the processes. This sort of calculation was first undertaken by Fisher (1918) and the steps are given by Crow and Kimura (1970). Fisher showed that estimates of heritability of stature in man need to be corrected for positive assortation amongst the parents to reduce them to a panmictic equivalent. Notation and basic results