阿摩線上測驗
17.Down syndrome is a human genetic disorder caused by the presence of an extra copy of which chromosome?
(A) Chromosome 13;
(B) Chromosome 18;
(C) Chromosome 21;
(D) Chromosome 23.
答案：登入後查看
統計： A(1), B(1), C(11), D(5), E(0) #3577746
統計： A(1), B(1), C(11), D(5), E(0) #3577746
