下图甲中4号为M病患者,对1、2、3、4进行关于M病的基因检测,将各

下图甲中4号为M病患者,对1、2、3、4进行关于M病的基因检测,将各自含有M病基因或正常基因的相关DNA片段(数字代表长度)用层析法分离,结果如下图乙。下列有关分析判断正确的是(    )

A.长度为9.7单位的DNA片段含有M病的致病基因

B.系谱图中3号个体的基因型与1、 2的基因型相同的概率为2/3

C.乙图中的个体d是系谱图中的4号

D.3与一M病基因携带者结婚,生一个M病孩子的概率为1/6

答案

C

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