【简答题】When a close friend dies, it often forces you to consider your own death. The more you have in common with the friend, the more his death will make you wonder about your own. Sometimes you will natura...
【简答题】句型转换。 1. I often go fishing in my spare time. (对画线部分提问) _______ do you often _______ in your spare time? 2. I like playing computer s because it is very interesting .(同上) _______ _______ you like ...
【简答题】阅读理解。 When a close friend dies, it often forces you to consider your own death. The more you have in common with the friend, the more his death will make you wonder about your own. Sometimes you will ...
【简答题】体育馆在学校的西偏北20°方向约200米的地方,那么学校在体育馆的______偏(______°)方向约______米的地方.
【单选题】人的X染色体和Y染色体形态不完全相同,存在着同源区(II)和非同源区(I、III),如图所示。下列有关叙述中错误的是( )
A.
位于Ⅰ片段的致病基因,在体细胞中不可能有等位基因
B.
Ⅱ片段上基因控制的遗传病,男性患病率不一定等于女性患病率
D.
性染色体既存在于生殖细胞中,也存在于体细胞中
【简答题】医院在商店的______面;光明小学在商店的______面;电影院在体育馆的______面;商店在体育馆的______面.
【单选题】人的X染色体和Y染色体大小、形态不完全相同,但存在着同源区(Ⅱ)和非同源区(Ⅰ、Ⅲ),如图所示。下列有关叙述错误的是 [ ]
A.
Ⅰ片段上隐性基因控制的遗传病,男性患病率高于女性
B.
Ⅱ片段上基因控制的遗传病,男性患病率可能不等于女性
D.
由于X、Y染色体互为非同源染色体,故人类基因组计划要分别测定