假设某种二倍体植物A的细胞质在遗传上不同于植物B。为了研究核-质关系,想获得一种植株,这种植株具有A的细胞质,而细胞核却主要是B的基因组,应该怎样做?
A×B的后代连续自交
B×A的后代连续自交
C. A×B后代连续与B回交
D. A×B的后代连续与A回交
E. B×A的后代连续与B回交
查看答案
下图谱系中,涂黑者为带有性状W的个体,这种性状在群体中是罕有的。如下哪种情况是与谱系中W的传递情况一致的?
A. 常染色体隐性
B. 常染色体显性
C. X连锁隐性
D. X连锁显性
E. Y连锁
听力原文:W: Jack, have you got the book I asked you to borrow the other day?
M: Sorry, I haven't.
W: How come ?
M: I couldn't find time to go to the library.
Why didn't Jack get the book?
A. Because he didn't want to borrow the book.
Because there wasn't such a book in the library.
C. Because he was too busy to go to the library.
听力原文:M: This program says the movie starts at 6 o'clock.
W: Let's hurry. We still have fifteen minutes.
Q: What time is it now?
(3)
A. 5:45.
B. 6:15.
C. 6:00.
D. 6:50.
【B3】
A. looking
B. waiting
C. calling
D. searching