【简答题】如图为某家族的遗传病系图谱(基因用A、a表示,且位于常染色体上),请据图分析回答: (1)该病是受______性基因控制的遗传病. (2)3号的基因型是______;9号的基因型是______. (3)3号和4号婚配,生育一个患病男孩的几率是______ (4)为降低此遗传病的发生,可采取哪些预防措施?(两种以上)______;______.
【简答题】Welcome back to “True Stories.” And now before we say good night...This next story is a really 1 one. Mary Gage, a 2 and art history teacher, had a very 3 night last night. Take a look at these photos...
【判断题】凡天然岩石被人类作材料使用即为天然石材。
【简答题】A woman will see her friend. Her friend’s home is very far. 1 she takes some hamburgers with her. 2 her way, she says to herself, “My friend will give 3 a very good lunch. I don’t need these hamburger...
【单选题】实心圆轴的抗扭截面系数为 W p= ( )