果蝇唾液腺细胞染色体上有许多宽窄不一的横纹下列对横纹的描述中正确的是a宽窄不一是dna复制次数不一致所致b每条横纹各代表一个基因c横纹 Template




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tomski果蝇唾液腺细胞染色体上有许多宽窄不一的横纹下列对横纹的描述中正确的是a宽窄不一是dna复制次数不一致所致b每条横纹各代表一个基因c横纹 coloring