问题
填空题 案例分析题
进行性肌营养不良的致病基因位于X染色体上，由一对等位基因（B、b）控制患者通常在20岁左右死于呼吸系统并发症。下图是某个家族的系谱，请分析回答问题：
Ⅰ代2号的基因型为（），Ⅱ代3号的基因型为（）
答案
参考答案：XBXb；XBY
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进行性肌营养不良的致病基因位于X染色体上，由一对等位基因（B、b）控制患者通常在20岁左右死于呼吸系统并发症。下图是某个家族的系谱，请分析回答问题：
Ⅰ代2号的基因型为（），Ⅱ代3号的基因型为（）
参考答案：XBXb；XBY
| 阅读理解。 | |
| Below is a web page from Google. | |
| |
| 1. When was the environmental symbol of Beijing Olympics made public? | |
| A. On January 23, 2005. B. On September 24, 2005. C. On February 5, 2007. D. On March 11, 2007. | |
| 2. Which of the following websites is designed for young researchers interested in the Olympics? | |
| A. Environment B. Green Olympics Forum In Beijing 2004 C. Olympic Games Quizzes and Olympic Games Trivia D. OFFICIAL WEBSITE OF THE OLYMPIC MOVEMENT | |
| 3. Which website provides a complete list of the winners in the Olympic Games? | |
| A. Olympic-Modern Olympic Games B. Green Olympics Forum In Beijing 2004 C. Environmental Symbol of Beijing Olympics -'Green Olympics' D. Ancient Olympic Heritage and Modern Olympic Games in Athens 2004 | |
| 4. What do we learn from the above web page? | |
| A. Beijing has made efforts to improve its air quality. B. The Olympic torch relay route has not been planned. C. The Olympic flag will be on display in Athens. D. A quiz on the Olympics will be held in Beijing. |