7.如图是染色体和dna的关系示意图下列说法正确的是 A.�由�和�构成b.生物体主要的遗传物质是�c.�都是成对存在的d.�主要存在于 Template




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tomski7.如图是染色体和dna的关系示意图下列说法正确的是 a.�由�和�构成b.生物体主要的遗传物质是�c.�都是成对存在的d.�主要存在于 coloring