14. John and Mary are planning to start a family. John was married once before, and he and his first wife had a child with cystic fibrosis. The brother of his current wife, Mary, died of cystic fibrosis. What is the probability that John and Mary will have a baby with cystic fibrosis? (Neither John, Mary, nor their parents have cystic fibrosis.)
(A)1/4
(B)1/6
(C)1/8
(D) 1/12
(E)1/16

答案:登入後查看
統計: A(74), B(33), C(36), D(4), E(7) #938809

詳解 (共 3 筆)

#3119948
cystic fibrosis是體隱(a...
(共 166 字,隱藏中)
前往觀看
22
0
#5941393
2/3×1/4=1/6
John的兒子有症狀->John 為Aa
Mary的哥哥有症狀->Mary可能為Aa or AA
兩人的兒子要有症狀=>須為Aa×Aa=aa(1/4)
John為Aa的可能性100%
Mary Aa的可能性為2/3
故2/3×1/4=1/6


1
0
#6530184


(共 1 字,隱藏中)
前往觀看
0
0

私人筆記 (共 1 筆)

私人筆記#6722487
未解鎖
 

(共 2 字,隱藏中)
前往觀看
2
0