牛的毛色有�色和棕色 如果两头�牛交配产生了一头棕色小牛 回答 1�色和棕色哪种是显性性状 2如果用b与b表示牛的毛色的显性 Template




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tomski牛的毛色有�色和棕色 如果两头�牛交配产生了一头棕色小牛 回答 coloring