表现度是指在不同的个体中由同一基因产生作用的严重程度不同。当表现极为轻微而无临床意义时称为顿挫型。由于表现度的不一致，能生育后代的患者往往病情较轻，但其孩子的病情常比亲代严重。是突变基因无规律性的一种表达形式。
虽然去年的平均准时表现度比前年提高3%，可是航班晚点依然接近四分之一。
The average on-time performance last year was 3 percentage points better than the year before, yet nearly one-quarter of all flights were late.
他们写到，“这些基因表现度的变化貌似是诊断肺部疾病的呼吸道上皮细胞最早期生理异常改变”。
“These changes in gene expression are likely the earliest biologic abnormalities in the small airway epithelium that lead to clinically detectable lung disease,” they wrote.
他们写到，“这些基因表现度的变化貌似是诊断肺部疾病的呼吸道上皮细胞最早期生理异常改变”。
"These changes in gene expression are likely the earliest biologic abnormalities in the small airway epithelium that lead to clinically detectable lung disease," they wrote.
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