在减数第一次分裂间期因某些原因使果蝇Ⅱ号染色体上的dna分子缺失了一个基因这种变异属于 A.染色体变异 B.基因重组 C.基因突变 Template




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tomski在减数第一次分裂间期因某些原因使果蝇Ⅱ号染色体上的dna分子缺失了一个基因这种变异属于 a.染色体变异 b.基因重组 coloring