mutationn.变化；突变；变异mutational site突变点, 突变位点mutation defect突变缺陷Mutation strain突变株mutation theory突变学说mutation effect突变效应mutation matrix突变基质mutational load突变负荷mutation plural元音变化构成的复数(如由man变出的men等)mutation period突变期mutation allele突变等位基因