18.CD【解析】该植物的花色遗传遵循基因的自由组合定律;亲本的基因型也可能是aBB和AAbb;F1的基因型为AaBb,含有两个显性基因,故F2中AAbb和aBB个体的表现型与F1相同;用F1作为材料进行测交实验,测交后代有3种表现型。故选CD。

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