21.父母皆為β thalassemia trait,則孩子是β thalassemia major的機率為何?
(A)0%
(B)25%
(C)50%
(D)100%
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統計: A(120), B(1676), C(470), D(145), E(0) #1741442
統計: A(120), B(1676), C(470), D(145), E(0) #1741442