下表是对我国某地一些家庭有无酒窝性状的抽样调查结果、请根据下_爱下问搜题

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问题填空题

下表是对我国某地一些家庭有无酒窝性状的抽样调查结果、请根据下表数据回答：

婚配方式			家庭数目	子女
组号	父亲	母亲		无酒窝	有酒窝
1	有酒窝	有酒窝	155	41	123
2	有酒窝	无酒窝	158	82	80
3	无酒窝	无酒窝	156	168	0

组号	父亲	母亲
1	______	______
2	______	______
3	______	______

（1）根据表中的第______组数据可以推出决定无酒窝的基因是______基因．

（2）如果显性基因用A表示，隐性基因用a表示，请你在下表中写出上述三组婚配中双亲的基因组成：

（3）如果第1组家庭中有酒窝子女与无酒窝的人婚配，能否生出无酒窝的孩子？______．

答案

（1）第1组家庭中，父母都有酒窝，子女中有无酒窝的；如果有酒窝是隐性性状，其子女只能是有酒窝；这与事实不符，说明无酒窝是由隐性基因决定的隐性性状．

（2）第1组家庭中，父母都有酒窝，子女中有无酒窝的，说明父母的基因组成都是Aa．第2组家庭中子女也有无酒窝的，父亲有酒窝，基因组成是Aa；母亲无酒窝，基因组成是aa．第3组家庭中，父母都无酒窝，基因组成都是aa．

（3）第1组家庭中父母的基因组成都是Aa，子女中有酒窝的基因组成是AA或Aa；Aa的人与无酒窝的人结婚，孩子的基因组成是Aa或aa，即能生出无酒窝的孩子．

故答案为：

（1）1；隐性

（2）（见表）

（3）能

单项选择题

Why is（）fun What delights may its practitioner expect as his reward First is the sheer joy of making things. As the child delights in his mud pie, so the adult enjoys building things, especially things of his own design. Second is the pleasure of making things that are useful to other people. Third is the fascination of fashioning complex puzzle-like objects of interlocking moving parts and watching them work in subtle cycles, playing out the consequences of principles built in from the beginning. Fourth is the joy of always learning, which springs from the（）nature of the task. In one way or another the problem is ever new, and its solver learns something: sometimes （）, sometimes theoretical, and sometimes both. Finally, there is the delight of working in such a tractable medium. The（）, like the poet, works only slightly removed from pure thought-stuff. Few media of creation are so flexible, so easy to polish and rework, so readily capable of realizing grand conceptual structures. Yet the program（）, unlike the poet’s words, is real in the sense that it moves and works, producing visible outputs separate from the construct itself. It prints results, draws pictures, produces sounds, moves arms. Programming then is fun because it gratifies creative longings built deep within us and delights sensibilities we have in common with all men.

Why is（）fun What delights may its practitioner expect as his reward First is the sheer joy of making things.

A．programming

B．composing

C．working

D．writing

单项选择题

根据《中华人民共和国证券法》的规定，证券交易所的临时停市应( )。

A．由证券交易所决法，并及时报告国务院

B．由国务院证券监方管理机构决定，证券交易所执行

C．由证券交易所决定，并及时报告国务院证券监督管理机构

D．中国各院决定，证券交易所执行