null mutation meaning in English
(空白突变)：能够完全消除基因功能，通常是由于基因的物理删除导致。
无效突变[由于大片段插入、缺失或重排而导致基因产物完全无效
Examples
- Gene duplication is one of the most important factors that influence the evolution of genome size , the origination of novel gene , the genetic robustness against null mutations , the speciation , etc
摘要基因重复是基因通过不等交换、逆转录转座或全基因组重复等途径产生一个与原基因相似的基因或碱基序列。 - Here we found g proteins also function in leaf , silique development and the yield of pollen microspore . we observed several traits or characters in the offsprings of gpal , agbl null mutation and gpa1 overexpression lines and found that the width of mutants " lamina is larger than that of the wild type , whereas the lamina length , petiole length and rosette diameter is smaller than the wild type , the ga overexpression lines is different from the mutants ; the silique length and the pedicel length is larger in mutants than that of wild type , and slightly smaller in overexpression lines than the control ; the morphometric character in silique tip is different in gpal from agbl mutants ; the yield of pollen microspore is larger in null mutants than wild type whereas smaller in overexpression lines
实验中我们跟踪观察了多代异三聚体g蛋白a亚基超表达转基因植株及a ， p亚基缺失突变体的表型特征，发现突变体的叶片宽度大于对应的野生型，叶片长度，叶柄长度及莲座直径小于野生型，而超表达植株的上述某些特征与突变体相反; gp时突变体的长角果长度，花梗柄部长度大于野生型，而超表达ga植株种英则略小于对照; gpal突变体长角果尖端未出现咭乙i突变体的特征: gpal ，口gbl突变体花粉生成量大于野生型，而超表达ga植株的花粉生成量则略小于对照。