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26.   of the I and in that area   covered with trees and grass.

A. two fifth;is      B two fifth:are   C Two fifths;is         D. Two fifths;are

27 I can’t shut my eyes to the fact      he did is unacceptable.

A. that             B. what         C that what          D. which

28 Paper produced every year is       the world’s production of vehicles

A three times weight of            B three times the weight of

C as three times as heavy           D three times so heavy as

29 I believe     you’ve done your best and      things will improve soon.

A whether;that      B / ; that        C that;which        D. If;that

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25. What a great gift he had   in local products!

A. for trading        B for trade       C to trade    D to trading

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22. -Can look at the menu for a few more minutes before I decide?

 -Of course     sir

 A. Make yourself at home          B Enjoy yourself

 C. It doesn’t matter              D Take your time

 23 Coco Cola, in which much sugar     ,is not part of a       diet.

 A. contained,health             B. is found,healthy

 C. finding, well                 D. containing,nutritious

 24 No one knows how large      universe is,but      man has never given up the attempt to explore new stars and new planets.

 A. the;/          B/; the          C/:/       D the;the

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21. -A cigarette, please?

 -No,thanks. I'm trying to      my smoking.

 A cut up           B. cut down      C. cut into       D. cut off

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20. I was really anxious about you;you     alone yesterday. It was dangerous in that area.

 A. mightn’t have gone           B. shouldn’t have gone

 C. mustn’t have gone             D couldn’t have gone

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19. Professor Li. many students want to see you.     they wait here or outside?

 A. Do         B Will          C. Shall      D Could

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18. Electricity like other forms of has greatly increased in price

 A. pressure     B energy        C. strength       D force

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17. She found the fashionable jeans she had been looking forward to     to others already

 A. selling       B being sold     C sold          D be sold

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16. -Who is your favorite basketball player in China?

-Yao Ming, of course No one plays

A. better        B. best         C. good      D. well

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53.(12分)多指为一种常染色体显性遗传病,受A基因控

   制;色盲是一种x染色体的隐性基因控制的遗传病,受

   b基因控制,分析下面的家系图,同答问题:  

(1)这两种遗传病的遗传遵循     定律:

(2)III-2的基因型是      ,她是纯合体的概率为        :

(3)如果Ⅳ一l是一个男孩.此男孩既是多指又是色盲的概率为    .只患多指不患色盲的概率为     

(4)如果Ⅳ-2是一个女孩。则她只患色盲而不患多指的概率为     。

51(14分)某中学两个生物研究性学习小组分别作了调查:

调查一:调查人群中有耳乖和无耳垂的遗传情况,统计结果如下表:

组别
婚配方式
家庭个数




无耳垂
由耳垂
无耳垂
由耳垂
1
无耳垂
无耳垂
60
37
0
23
0
2
由耳垂
无耳垂
300
56
102
50
105
3
无耳垂
由耳垂
100
24
28
19
33
4
由耳垂
由耳垂
200
35
78
25
67

调查二:调查人群中的拇指能否向背侧弯曲的遗传情况(该性状为常染色体遗传),统计汇

总和整理见下表:

      亲代类型
 
子代类型
1
2
3
双亲均为拇指能向背侧弯曲
双亲中只有一个为拇指能向背侧弯曲
双亲全为拇指不能向背侧弯曲
拇指能向背侧弯曲
480
480
0
拇指不能向背侧弯曲
288
488
全部子代均为拇指不能向背侧弯曲

请回答:

(1)调查一的相对性状中,属于显性性状的是     :调查二中的第    组结果可判断

该性状的显、隐性,简要说明理由      。

(2)父亲有耳垂、拇指不能向背侧弯曲,母亲无耳垂、拇指能向背侧弯曲,生育了一个无耳垂、拇指不能向背侧弯曲的男孩,若再生一个有耳垂、拇指不能向背侧弯曲女孩的概率是

      

(3)调查结果往往与实际水平有一定的差距,要想缩小与实际水平的差距,在调查时应采

取哪些措施?     。(答出2条)

(4)某人患w遗传病,不知控制w遗传病的基因在染色体上的位置,请你设计一个简单的调查方案进行调查,并预测调查结果。(说明:w遗传病为单基因控制的隐性遗传病)

附加题(10分):小家鼠的毛色的黄与灰为一对相对性状.由等位基因B、b控制;尾形的弯曲与正常为另一对相对性状,由等位基因T、t控制。在毛色遗传中,具有某种纯合基因型的合子不能完成胚胎发育。让毛色、尾型相同的多对小家鼠交配.其中雌鼠的基因型相同,

雄鼠的基因型相同,所得子一代类型及其在子一代总数中的比例如下表。请回答:

 
黄毛尾弯曲
黄毛尾正常
灰毛尾弯曲
灰毛尾正常
雌鼠
4/12
0
2/12
0
雄鼠
2/12
2/12
1/12
1/12

(l)控制毛色的基因在     染色体上,不能完成胚胎发育的台子基因型是    。

(2)小家鼠尾形性状中,显性性状是      ,控制该性状的基因在     染色体上。

(3)亲代雌鼠、雄鼠的基因型分别是       、       。子一代中灰毛尾正常小家鼠的基因型是     

(4)选取子一代中灰毛尾弯曲的纯合雌鼠与黄毛尾正常的雄鼠,进行一次杂交实验,请预期实验结果,并用遗传图解表示。

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