摘要：一对正常夫妇生了一个患白化病的男孩.再生一个正常孩子的几率是( ) A.75% B.25% C.12.5% D.37.5% 1-5 ABDCD 6-10 ABDDC 11-15 ABCCD 16-20 CDCCB 21-25 DDDDA 26-30 CACAA 31-35 BCABA 36- 40 DABAB 41-45 AAADD 46-50 ADBCB 51-55 BCCDB 56-60 BDBAC 61-65 BCBBD 66-70 ABABD 71-75 ADBAA
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