共查询到4条相似文献,搜索用时 0 毫秒
1.
Spontaneous mutation rates at five coat-color loci in mice 总被引:1,自引:0,他引:1
Examination of 1.5 million mice yielded natural mutation rates estimnated from 5.2 million gene reproductions at five specific coat-color loci. The average rates were 11.1 x 10(-6) for forward mutations and 2.7 x 10(-6) for reverse mutations. Differences between the frequencies of mutations at the individual loci were evident. 相似文献
2.
Hemoglobin I mutation encoded at both alpha-globin loci on the same chromosome: concerted evolution in the human genome 总被引:3,自引:0,他引:3
S A Liebhaber E F Rappaport F E Cash S K Ballas E Schwartz S Surrey 《Science (New York, N.Y.)》1984,226(4681):1449-1451
Genetic analysis of an individual expressing an unexpectedly high level of hemoglobin I, an alpha-globin structural mutant, reveals that the mutation is present at both the alpha 1- and the alpha 2-globin gene loci. Kindred analysis confirms that the two affected genes are located in cis. The most likely explanation for this finding is that a recent conversion event occurred within the human alpha-globin gene cluster. 相似文献
3.
二花脸猪obese基因3714位点多态性与产仔性状的相关性 总被引:1,自引:0,他引:1
利用Bi PASA技术检测了二花脸猪OB基因的多态性 ,并且分析了其与母猪产仔性能的相关性。结果显示 ,OB基因在第 371 4碱基处存在G/T替换 ,经Bi PASA检测后分别定义为等位基因G和T。在二花脸母猪群中 ,等位基因G和T的频率分别为 0 339和 0 6 6 1。方差分析发现 ,G/G基因型个体的头胎产仔数以及平均产仔数略低于G/T型和T/T型个体 ,但相互之间无显著差异 ;在最高产仔数性状上 ,G/G型个体显著低于G/T型和T/T型个体 (P <0 0 5 )。表明G/G型个体的产仔潜力显著偏低 相似文献
4.
两种典型温度下农村化粪池出水氮素在原地土壤中的迁移转化过程 总被引:1,自引:1,他引:0
为探究典型温度下(25℃和5℃)农村化粪池出水氮素在排污口原地土壤中的迁移转化过程,采集原地表层土壤及化粪池出水,构建室内模拟系统,分析化粪池出水经土壤渗滤前后氮素组成。结果表明,农村化粪池出水氮素以可溶性无机氮(DIN)为主,其中NH4+-N占70%以上;两种温度条件下化粪池出水DIN差异不显著(P>0.05,n=12),NH4+-N、NO2--N、NO3--N浓度均具有极显著性差异(P<0.01,n=12),25℃时硝化作用明显,导致出水NH4+-N低于5℃,NO2--N、NO3--N高于5℃;两种温度条件下原地土壤对化粪池出水DIN均有削减作用,其中NH4+-N削减量均占DIN削减量60%以上;25℃和5℃条件下,NH4+-N削减率分别为23.11%~47.37%和25.37%~43.47%;25℃时NH4+-N削减主要通过氨挥发、反硝化、厌氧氨氧化等作用完成,而5℃时NH4+-N削减主要通过土壤NH4+-N吸附作用完成;25℃时土壤对NO3--N还存在蓄积作用。研究表明,两种温度下化粪池出水NO2--N和NO3--N在原地土壤中可发生反硝化或异化还原作用进而得到削减。 相似文献