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首页> 外文期刊>Journal of genetics >Quantitative-genetic analysis of wing form and bilateral asymmetry in isochromosomal lines of Drosophila subobscura using Procrustes methods
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Quantitative-genetic analysis of wing form and bilateral asymmetry in isochromosomal lines of Drosophila subobscura using Procrustes methods

机译：应用Procrustes方法对果蝇亚黑蝶等值线的翼形和双侧不对称性进行定量遗传分析

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Fluctuating asymmetry (FA) is often used as a measure of underlying developmental instability (DI), motivated by the idea that morphological variance is maladaptive. Whether or not DI has evolutionary potential is a highly disputed topic, marred by methodological problems and fuzzy prejudices. We report here some results from an ongoing study of the effects of karyotype, homozygosity and temperature on wing form and bilateral asymmetry using isochromosomal lines of Drosophila subobscura. Our approach uses the recently developed methodologies in geometric morphometrics to analyse shape configurations of landmarks within the standard statistical framework employed in studies of bilateral asymmetries, and we have extended these methods to partition the individual variation and the variation in asymmetries into genetic and environmental causal components. The analyses revealed temperature-dependent expression of genetic variation for wing size and wing shape, directional asymmetry (DA) of wing size, increased asymmetries at suboptimal temperature, and a transition from FA to DA in males as a result of increase in the rearing temperature. No genetic variation was generally detected for FA in our samples, but these are preliminary results because no crosses between lines were carried out and, therefore, the contribution of dominance was not taken into account. In addition, only a subset of the standing genetic variation was represented in the experiments.
机译：波动不对称性（FA）通常被用作衡量潜在的发育不稳定性（DI）的量度，其动机是形态学变异是适应不良的。 DI是否具有进化潜力是一个备受争议的话题，受到方法论问题和模糊偏见的损害。我们在这里报告正在进行的研究结果，这些研究涉及果蝇亚等暗线的核型，纯合性和温度对机翼形式和双侧不对称性的影响。我们的方法使用最近在几何形态计量学中开发的方法来分析用于双边不对称性研究的标准统计框架内的地标形状配置，并且我们将这些方法扩展为将个体变异和不对称性变异划分为遗传和环境因果成分。这些分析揭示了机翼大小和机翼形状的遗传变异的温度依赖性表达，机翼大小的方向不对称（DA），在次适温下的不对称性增加以及饲养温度升高导致雄性从FA向DA过渡。在我们的样品中，通常未检测到FA的遗传变异，但这是初步结果，因为未进行品系间的杂交，因此未考虑优势的贡献。另外，实验中仅代表了常设遗传变异的一个子集。

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