75.大约在70个表型正常的人中有一个白化基因杂合子。一个表型正常,其双亲也正常,但有一个白化病弟弟的女人,与一个无亲缘关系的正常男人婚配。问他们所生的孩子患白化病的概率是:( )
A.1/4 B.1/9 C.1/420 D.1/560
|
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
|
B |
D |
B |
A |
C |
B |
B |
B |
B |
C |
|
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
|
D |
D |
B |
B |
A |
A |
A |
D |
A |
A |
|
21 |
22 |
23 |
24 |
25 |
26 |
27 |
28 |
29 |
30 |
|
D |
A |
D |
A |
B |
D |
A |
C |
A |
C |
|
31 |
32 |
33 |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
|
B |
D |
D |
D |
B |
B |
C |
B |
D |
D |
|
41 |
42 |
43 |
44 |
45 |
46 |
47 |
48 |
49 |
50 |
|
C |
B |
C |
A |
B |
A |
D |
D |
C |
D |
|
51 |
52 |
53 |
54 |
55 |
56 |
57 |
58 |
59 |
60 |
|
B |
B |
C |
B |
B |
C |
D |
B |
C |
B |
|
61 |
62 |
63 |
64 |
65 |
66 |
67 |
68 |
69 |
70 |
|
D |
B |
A |
C |
A |
C |
B |
A |
C |
D |
|
71 |
72 |
73 |
74 |
75 |
|
|
|
|
|
|
B |
C |
B |
A |
C |
|
|
|
|
|
高三第14周答案:
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