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呈常染色体显性遗传()。

发布日期:2021-03-15

呈常染色体显性遗传()。
A

多发性肌炎

B

肢带型肌营养不良

C

面肩肱型肌营养不良

D

假肥大性肌营养不良

E

进行性脊肌萎缩症

试题解析

常染色体显性遗传

常染色体显性遗传是指缺陷基因呈显性表达,50%的子女都有发病可能性的遗传性疾病。基因的作用可受环境和其他基因的影响而改变其表型的表达(表现度)。因此,即使在同一家庭中,有相同基因改变(等位基因)者可表现出非常不同的表型。例如Waardenburg综合征Ⅰ型中,PAX3基因突变产生的典型表现是额部白发,眼距增宽,虹膜异色,但有20%不到的病例有严重的听力丧失。

中文名
常染色体显性遗传
影响
受环境和其他基因的影响
限性遗传
仅见于某性别的特征称为限性遗传
规律
男女患病的机会相等
多效性
器官系统产生多种异常
领域
生物

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神经电生理脑电图技术(主管技师)

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