问答题
家蚕第二条染色体上有6个基因，其相对距离如下所示，请绘出相应的遗传图谱。
| Gr | Rc | S | Y | P | oa | |
| Gr | 25 | 1 | 19 | 7 | 20 | |
| Rc | 25 | 26 | 6 | 32 | 5 | |
| S | 1 | 26 | 20 | 6 | 21 | |
| Y | 19 | 6 | 20 | 26 | 1 | |
| P | 7 | 32 | 6 | 26 | 7 | |
| oa | 20 | 5 | 21 | 1 | 27 | |
【参考答案】
问答题
| Gr | Rc | S | Y | P | oa | |
| Gr | 25 | 1 | 19 | 7 | 20 | |
| Rc | 25 | 26 | 6 | 32 | 5 | |
| S | 1 | 26 | 20 | 6 | 21 | |
| Y | 19 | 6 | 20 | 26 | 1 | |
| P | 7 | 32 | 6 | 26 | 7 | |
| oa | 20 | 5 | 21 | 1 | 27 | |