dd和tt是位于两对同源染色体上的两对等位基因控制两对相对性状若两个纯合亲本杂交得到f1的基因型为ddttf1自交得到f2下列叙述 Template




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tomskidd和tt是位于两对同源染色体上的两对等位基因控制两对相对性状若两个纯合亲本杂交得到f1的基因型为ddttf1自交得到f2下列叙述 coloring