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【单选题】
Which of the following statements regarding the Drosophila Bar phenotype is NOT true?A.
Unequal crossing over event may give a rise to the duplication of the Bar region.
B.
The trait is inherited as a complete dominant where both homozygous and heterozygous show similar phenotype.
C.
The more Bar segment copy the fly has, the more reduced the facets in the eyes get.
D.
The Bar phenotype reflects the genetic phenomenon called gene dosage effect.
E.
The balance of gene product is critical to cell function and normal development.
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举一反三
【单选题】典型心绞痛的临床特点不包括( )
A.
常有诱发因素，如劳累、情绪激动等
B.
发作时有胸痛表现
C.
发作胸痛持续时间一般>20分钟
D.
休息或服用硝酸甘油可快速缓解