报春花的花色表现为白色和黄色一对相对性状由两对等位基因共同控制显性基因a控制以白色素为前体物合成黄色锦�色素的代谢过程但当显性基因b存在 Template




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tomski报春花的花色表现为白色和黄色一对相对性状由两对等位基因共同控制显性基因a控制以白色素为前体物合成黄色锦�色素的代谢过程但当显性基因b存在 coloring