5. We must not the good traditions passed down from generation.
A. Catch sight of B. lose the sight of C. lose sight of D. catch the sight of
6 The writer ___ his writing so that he forgot to have his lunch.
A absorbed B was absorbed into C absorbed into D was absorbed in
7 The ___ look on his face showed that he hadn’t expected it .
A astonished B astonishing C being astonished D having astonished
4.As you know, the Group of Eight is an organization the richest countries in the world.
A is consisted of sisting of C.cosists of sisted of
3. After his journey from abroad, Richard Jones returned home, .
A exhausting B exhausted C being exhausted D having exhausted
2. It’s very dangerous to be ____ to the SARS virus without any protection.
A disclosed B uncover C affected D exposed
1. -I enjoyed the food very much.
-I’m glad you like it. Please drop in any time you like.
-________
A. Is it all right? B. I'm afraid I won't be free.
C. Yes, I will. D. That's great.
62、下图为对某一家族中甲、乙两种遗传病调查后得到的系谱图。I-4的家庭中没有乙病史。
![]()
试回答(以A与a、B与b依次表示甲、乙两种遗传病基因及等位基因);
⑴甲病的遗传属于 染色体 性遗传;乙病最可能属于 染色体 性遗传。
(2)若U已两病兼发的哥哥,则U正常的可能性为 。
![]()
61、(10分)番茄果实的颜色由一对遗传因子A、a控制着,下表是关于番茄果实颜色的3个杂交实验及其结果。请分析回答:
|
实验组 |
亲本表现型 |
F1的表现型和植株数目 |
|
|
红果 |
黄果 |
||
|
1 |
红果×黄果 |
492 |
504 |
|
2 |
红果×黄果 |
997 |
0 |
|
3 |
红果×红果 |
1511 |
508 |
(1)番茄的果色中,显性性状是
,这一结论是依据实验
得出。
(2)写出3个实验中两个亲本的遗传因子组合。
实验一: ;实验二: ;实验三:
60、下图中,横轴表示细胞周期,纵轴表示一个细胞核中DNA含量或染色体数目的变化情况。请分析,能表示有丝分裂中DNA含量变化的曲线是( )
![]()
A.① B.② C.③ D.④
第II卷 非选择题(共40分)
59、某生物细胞有丝分裂后期细胞中有92个着丝点,这种生物细胞在减数第二次分裂中有染色体
数目最多是( )
A、92条 B、46条 C、23条 D、69条
57、减
数分裂四分体时期的细胞中,每个染色体与其DNA分子数之比是( )
A、1:2 B、1:4 C、1:8 D、2:1
58某动物体细胞中含有38条染色体,该动物细胞处于四分体时期时,含有双链DNA的个数是( )
A、38个 B、76个 C、少于76个 D、多于76个
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