Heritability of Directional Asymmetry in Drosophila melanogaster.
Heritability of Directional Asymmetry in Drosophila melanogaster.
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DOI：
10.4061/2009/759159
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发表时间：
2009-09-13
期刊：
影响因子：
--
通讯作者：
Houle D
中科院分区：
文献类型：
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作者：
Carter AJ;Osborne E;Houle D
方向不对称性（DA），一对形态结构之间的一致差异，其中同一侧总是大于另一侧，呈现出进化之谜。虽然许多配对性状显示DA，DA的遗传变异尚未明确证明。人工选择是一种强大的技术，用于发现可选择的遗传变异，我们回顾和批评的有限数量的以前的研究，已进行选择DA和提出一种新的人工选择实验的结果DA的后横脉位置在果蝇翅膀。在两个遗传上不同的品系中进行了15代选择，没有一个品系显示出对选择的显著响应。因此，我们的研究结果支持并再次证实了以前的研究结果，尽管明显的自然变异和进化的DA在自然界中，DA仍然是一个矛盾的性状，不响应人工选择。
Directional asymmetry (DA), the consistent difference between a pair of morphological structures in which the same side is always larger than the other, presents an evolutionary mystery. Although many paired traits show DA, genetic variation for DA has not been unambiguously demonstrated. Artificial selection is a powerful technique for uncovering selectable genetic variation; we review and critique the limited number of previous studies that have been performed to select on DA and present the results of a novel artificial selection experiment on the DA of posterior crossvein location in Drosophila wings. Fifteen generations of selection in two genetically distinct lines were performed and none of the lines showed a significant response to selection. Our results therefore support and reconfirm previous findings; despite apparent natural variation and evolution of DA in nature, DA remains a paradoxical trait that does not respond to artificial selection.