问题 填空题

请按要求回答下列(1)、(2)小题:

(1)甲病是一种伴性遗传病(致病基因为Xb),乙病是一种常染色体遗传病(致病基因为r)。一对表现型正常的夫妇生下一个既患甲病又患乙病的孩子,则这对夫妇的基因型分别为________和_________。如果他们再生育一个孩子,该孩子患病的概率是__________,只患乙病的概率是___________,同时患甲、乙两种病的孩子的性别是__________。

(2)苯丙酮尿症是新生儿中发病率较高的一种遗传病。患儿由于缺少显性基因H,导致体内苯丙氨酸羟化酶缺乏,使来自食物的苯丙氨酸沿非正常代谢途径转变成苯丙酮酸。苯丙酮酸在体内积累过多,就会造成患儿神经系统损害。目前防治这种疾病的有效方法是尽早采用食疗法,即给予患儿低苯丙氨酸饮食。

①.请根据以上知识补充完成上表(其中,含量用“正常”、“过多”、“缺乏”表示)。

②.若用基因工程方法治疗苯丙酮尿症,其基本思路是:_________。

答案

(1)XaXbBr或RrXaXb       XaYbr或BrXaY      7/16     3/16     男性

(2)①.

②.获取苯丙氨酸羟化酶基因;将苯丙氨酸羟化酶基因与病毒结合;将苯丙氨酸羟化酶基因与病毒的结合体导入患者体细胞;苯丙氨酸羟化酶基因的检测和表达。

完形填空
完形填空。
     What is intelligence (智力) anyway? When I was in the army I  1   an intelligence test that all soldiers
took, and, against  2    of 100, I scored 160.
     I had an auto-repair man once, who, on these intelligence tests, could not   3   have scored more than
80.  4  , when anything went wrong with my car I hurried to him-and he always  5   it.
      Well, then, suppose my auto-repair man  6  questions for some intelligence tests. By every one of
them I'd prove myself a  7  . In a world where I have to work with my  8  , I'd do poorly.
     Consider my auto-repair man  9  . He had a habit of telling   10   .One time he said, "Doc, a deaf-and-dumb (聋哑) man   11   some nails. Having entered a store, he put two fingers together on the counter
and made  12   movements with the other hand. The clerk brought him a hammer. He 13  his head and
pointed to the two fingers he was hammering. The clerk  14  him some nails. He picked out the right size
 and left. Well, Doc, the 15  man who came in was blind. He wanted scissors (剪刀).  16  do you
suppose he asked for them?" I lifted my right hand and made scissoring movements with my first two
fingers. He burst out laughing and said, "Why, you fool,he used his 17  and asked for them. I've been
 18   that on all my customers today,but I knew  19   I'd catch you." "Why is that?" I asked. "Because
you are so goddamned educated. Doc. I knew you couldn't be very  20  ".
And I have an uneasy feeling he had something there.
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