DOMINANCE VARIANCE - ASSOCIATIONS WITH SELECTION AND FITNESS
DOMINANCE VARIANCE - ASSOCIATIONS WITH SELECTION AND FITNESS
复制标题
DOI：
10.1038/hdy.1995.169
复制
发表时间：
1995-11-01
期刊：
影响因子：
3.8
通讯作者：
ROFF, DA
中科院分区：
文献类型：
--
作者：
CRNOKRAK, P;ROFF, DA
强方向性选择，在某种程度上是稳定性选择，通常只侵蚀加性遗传方差，而不影响显性方差。因此，与适合度密切相关的性状应表现出高水平的显性方差。在这项研究中，我们编制了大量的估计优势方差，以确定是否性状受到强选择和/或密切相关的健身有较高水平的优势方差比性状较少受到选择压力。从文献中获取野生和家养物种的估计值，并分别对每组进行处理。性状密切相关的健身（生活史）有显着更高的优势成分比性状更远的健身（形态学）的野生物种。国内种的生活史和形态特征之间没有显着差异。已知受到强烈定向选择的性状（家养物种的形态性状）的显性估计值显著高于假定没有受到强选择的性状（野生远交物种的形态性状）。结果进行了讨论，相对于维护的遗传变异和偏置引入的全同胞遗传力估计的高水平的显性方差的计算。
Strong directional, and to some degree stabilizing, selection usually erodes only additive genetic variance while not affecting dominance variance. Consequently, traits closely associated with fitness should exhibit high levels of dominance variance. In this study we compile a large number of estimates of dominance variance to determine if traits that are subject to strong selection and/or are closely associated with fitness have higher levels of dominance variance than traits less subject to selection pressure. Estimates were taken from the literature for both wild and domestic species and each group was treated separately. Traits closely associated with fitness (life history) had significantly higher dominance components than did traits more distantly related to fitness (morphology) for wild species. No significant differences were found between life history and morphological traits for domestic species. Traits that were known to have been subject to intense directional selection (morphological traits for domestic species) had significantly higher dominance estimates than did traits that were assumed not to have been subject to strong selection (morphological traits for wild outbred species). The results are discussed with respect to the maintenance of heritable variation and the bias introduced in the calculation of the full-sib heritability estimate by high levels of dominance variance.