某生物的三对等位基因(Aa、Bb、Cc)分别位于三对同源染色体上,且

某生物的三对等位基因(AaBbCc)分别位于三对同源染色体上,且基因AbC分别控制①②③三种酶的合成,在三种酶的催化下可使一种无色物质经一系列转化变为黑色素.假设该生物体内黑色素的合成必须由无色物质转化而来,如图所示:现有基因型为AaBbCc的两个亲本杂交,出现黑色子代的概率为(  )

 

A

B

C

D

答案

C

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