| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
如果自由交配，则F2中AA占
| 2 |
| 3 |
| 2 |
| 3 |
| 4 |
| 9 |
| 2 |
| 3 |
| 1 |
| 3 |
| 4 |
| 9 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 9 |
| 4 |
| 9 |
| 4 |
| 9 |
| 2 |
| 3 |
因此，自交和自由交配得到的F2中A的基因频率相同，都为
| 2 |
| 3 |
| 1 |
| 3 |
| 4 |
| 9 |
故选：C．
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 4 |
| 9 |
| 2 |
| 3 |
| 1 |
| 3 |
| 4 |
| 9 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 9 |
| 4 |
| 9 |
| 4 |
| 9 |
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
| 4 |
| 9 |