下面是两个有关色盲遗传的家系,其中两个家系的7号个体色盲基因

下面是两个有关色盲遗传的家系,其中两个家系的7号个体色盲基因分别来自 Ⅰ 代中的                                               (  )

A.2号和1号                B.4号和4号

C.2号和2号                D.3号和4号

 

答案

B

 

色盲是伴X染色体遗传病,儿子的患病基因只能来自母亲,而Ⅰ代的3号个体又正常,因此,7号的色盲基因只能来自Ⅰ代中的4号个体。

 

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