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【简答题】
宽狭叶是某种自花传粉植物的一对相对性状,控制该相对性状的相关基因符合自由组合定律,现用纯合的宽叶与狭叶荠菜做亲本进行杂交实验,结果如下表。请回答: (1)根据以上三组实验可推知,该性状至少受____对等位基因控制,其依据是______定律。 (2)杂交组合三的了一代基因型为________(显性基因分别用A、B、C、D......表示),其子二代中宽叶植株的基因型有__种。 (3)若将杂交组合二的子二代中宽叶个体收获后,每株的所有种子单独种植在一起得到一个株系。所有株系中,子代表现出宽叶∶狭叶=15∶1的株系比为____。
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