填空题按照经典遗传学对基因的概念，可以把（）和突变单位统称为结构单位。这样基因即是一个结构单位，又是一个功能单位。
填空题
按照经典遗传学对基因的概念，可以把（）和突变单位统称为结构单位。这样基因即是一个结构单位，又是一个功能单位。
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