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下表表示果蝇6 个品系(纯系)的性状和携带这些基因的染色体，品系②～⑥有一个性状是隐性性状，其他性状显性性状。请回答下列问题： (1)形成果蝇棕眼、紫眼的直接原因与色素形成有关，形成色素需要经历一系列的生化反应，而每一反应各需要一种酶催化，这些酶分别由相应的基因编码。该实例表明基因控制性状的方式之一是______________。 (2)某同学选用基因型分别为AAcc与aaCC两个纯系果蝇进行两对相对性状的杂交实验，他经过若干次实验体现孟德尔的自由组合定律，他百思不得其解。你给他的合理解释是______________。 (3)让品系②的雌性个体与品系④的雄性个体进行交配，得到的F 1 的基因型可能有______。 (4)在正常情况下，果蝇的长翅和残翅是一对相对性状，但残翅果蝇的数量不到长翅果蝇的5%。请用现代生物进化理论简要分析原因______________。 (5)某实验小组对果蝇的灰体(V)与黑体(v)这对相对性状做遗传研究。如果用含有某种添加剂的食物喂养果蝇，所有果蝇都是黑体，现有一只用含有这种添加剂的食物喂养的黑体雄果蝇，请设计一个实验探究其基因型，写出简要的实验设计思路：_______________。
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