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
25. What a great gift he had in local products!
A. for trading B for trade C to trade D to trading
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
21. -A cigarette, please?
-No,thanks. I'm trying to my smoking.
A cut up B. cut down C. cut into D. cut off
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
19. Professor Li. many students want to see you. they wait here or outside?
A. Do B Will C. Shall D Could
18. Electricity like other forms of has greatly increased in price
A. pressure B energy C. strength D force
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
16. -Who is your favorite basketball player in China?
-Yao Ming, of course No one plays
A. better B. best C. good D. well
53.(12分)多指為一種常染色體顯性遺傳病,受A基因控
制;色盲是一種x染色體的隱性基因控制的遺傳病,受
b基因控制,分析下面的家系圖,同答問題:
(1)這兩種遺傳病的遺傳遵循 定律:
![]()
(2)III-2的基因型是 ,她是純合體的概率為 。
(3)如果Ⅳ一l是一個男孩.此男孩既是多指又是色盲的概率為 .只患多指不患色盲的概率為 :
(4)如果Ⅳ-2是一個女孩。則她只患色盲而不患多指的概率為 。
51(14分)某中學(xué)兩個生物研究性學(xué)習(xí)小組分別作了調(diào)查:
調(diào)查一:調(diào)查人群中有耳乖和無耳垂的遺傳情況,統(tǒng)計結(jié)果如下表:
|
組別 |
婚配方式 |
家庭個數(shù) |
子 |
女 |
|||
|
父 |
母 |
無耳垂 |
由耳垂 |
無耳垂 |
由耳垂 |
||
|
1 |
無耳垂 |
無耳垂 |
60 |
37 |
0 |
23 |
0 |
|
2 |
由耳垂 |
無耳垂 |
300 |
56 |
102 |
50 |
105 |
|
3 |
無耳垂 |
由耳垂 |
100 |
24 |
28 |
19 |
33 |
|
4 |
由耳垂 |
由耳垂 |
200 |
35 |
78 |
25 |
67 |
調(diào)查二:調(diào)查人群中的拇指能否向背側(cè)彎曲的遺傳情況(該性狀為常染色體遺傳),統(tǒng)計匯
總和整理見下表:
|
親代類型 子代類型 |
1 |
2 |
3 |
|
雙親均為拇指能向背側(cè)彎曲 |
雙親中只有一個為拇指能向背側(cè)彎曲 |
雙親全為拇指不能向背側(cè)彎曲 |
|
|
拇指能向背側(cè)彎曲 |
480 |
480 |
0 |
|
拇指不能向背側(cè)彎曲 |
288 |
488 |
全部子代均為拇指不能向背側(cè)彎曲 |
請回答:
(1)調(diào)查一的相對性狀中,屬于顯性性狀的是 :調(diào)查二中的第 組結(jié)果可判斷
該性狀的顯、隱性,簡要說明理由 。
(2)父親有耳垂、拇指不能向背側(cè)彎曲,母親無耳垂、拇指能向背側(cè)彎曲,生育了一個無耳垂、拇指不能向背側(cè)彎曲的男孩,若再生一個有耳垂、拇指不能向背側(cè)彎曲女孩的概率是
。
(3)調(diào)查結(jié)果往往與實際水平有一定的差距,要想縮小與實際水平的差距,在調(diào)查時應(yīng)采
取哪些措施? 。(答出2條)
(4)某人患w遺傳病,不知控制w遺傳病的基因在染色體上的位置,請你設(shè)計一個簡單的調(diào)查方案進行調(diào)查,并預(yù)測調(diào)查結(jié)果。(說明:w遺傳病為單基因控制的隱性遺傳病)
附加題(10分):小家鼠的毛色的黃與灰為一對相對性狀.由等位基因B、b控制;尾形的彎曲與正常為另一對相對性狀,由等位基因T、t控制。在毛色遺傳中,具有某種純合基因型的合子不能完成胚胎發(fā)育。讓毛色、尾型相同的多對小家鼠交配.其中雌鼠的基因型相同,
雄鼠的基因型相同,所得子一代類型及其在子一代總數(shù)中的比例如下表。請回答:
|
|
黃毛尾彎曲 |
黃毛尾正常 |
灰毛尾彎曲 |
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 染色體上,不能完成胚胎發(fā)育的臺子基因型是 。
(2)小家鼠尾形性狀中,顯性性狀是 ,控制該性狀的基因在 染色體上。
(3)親代雌鼠、雄鼠的基因型分別是 、 。子一代中灰毛尾正常小家鼠的基因型是 。
(4)選取子一代中灰毛尾彎曲的純合雌鼠與黃毛尾正常的雄鼠,進行一次雜交實驗,請預(yù)期實驗結(jié)果,并用遺傳圖解表示。
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