造成人类遗传病的原因有多种.在不考�基因突变的情况下回答下列问题121三体综合征一般是由于第21号染色体数目异常造成的.a和a是位于21 Template




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tomski造成人类遗传病的原因有多种.在不考�基因突变的情况下回答下列问题121三体综合征一般是由于第21号染色体数目异常造成的.a和a是位于21 coloring