下表是豌豆五种杂交组合的实验统计数据，据表判断下列叙述不合理的是（）组别表现型高茎红花高茎白花矮茎红花矮茎白花一高茎红花×矮茎红花627203617212二高茎红花×高茎白花724750243262三_刷题宝

题干

下表是豌豆五种杂交组合的实验统计数据，据表判断下列叙述不合理的是（）

组别	表现型	高茎红花	高茎白花	矮茎红花	矮茎白花
一	高茎红花×矮茎红花	627	203	617	212
二	高茎红花×高茎白花	724	750	243	262
三	高茎红花×矮茎红花	953	317	0	0
四	高茎红花×高茎红花	925	328	315	108
五	高茎白花×矮茎红花	517	523	499	507

A：通过第一、四组可以得出红花对白花为显性性状，通过第二、四组可以得出高茎对矮茎为显性性状

B：以A和a分别表示茎高度的显、隐性基因，D和d分别表示花色的显、隐性基因。则第一组两个亲本植株的基因型为AaDd、aaDd

C：每一组杂交后代的纯合子的概率都相同

D：最容易获得双隐性个体的杂交组合是第五组

上一题下一题 0.0难度选择题更新时间:2016-06-22 06:40:29

答案(点此获取答案解析）

C

同类题1

某DNA分子中含有1 000个碱基对（P元素只含³²P）。若将DNA分子放在只含³¹P的脱氧核苷酸的培养液中让其复制两次，则子代DNA的相对分子质量平均比原来

同类题2

如图，是一副三角板组成的图形．

同类题3

右边的漫画反映的是今年我国实行的养老金“并轨”政策。养老金“并轨”是指对机关事业单位工作人员实行和企业职工一样的基本养老保险制度。这一制度表明（）

①我国完善分配制度，逐步实现平均分配 ②分配制度改革是实现全体人民共同富裕的关键

③党和政府贯彻落实科学发展观 ④我国致力于维护社会公平正义

同类题4

按你听到的顺序给图片标序号。

____

____

____

____

____

同类题5

请认真阅读下面短文，然后从短文后各题所给的A.B.C.D四个选项中，选出一个最佳选项补全短文。

One day, several young people went for a picnic. They walked in the open air with 1.

As soon as they came to a river, they 2 by the clear and calm water. They played with cool water excitedly. Suddenly, a lovely 3 passed by Tom. He tried to catch it, 4 the fish was just swimming a few feet ahead of him. He ran 5 it, hoping to catch it.

Gradually, Tom came to the water with waist deep. He felt 6, so he wanted to jump out of the water. 7 up and down in the water, he went farther and farther away from the bank. Just at that time, Barry saw this, he offered 8 help to Tom at once. Tom saw someone 9 to him, he caught the person 10 was close to him. Unfortunately, Barry was dragged into the water. The two struggled in the water 11. Amy, on the bank, noticed that, and she 12 others near the bank.

Hearing their cries, two farmers near the river took a long rope there. They threw one end of the rope to 13 of them in the water. Together, all the people on the bank pulled 14 end.

Finally, the two boys were saved!

The experience has told us 15 we should do something to help others correctly.

小学学科试题库

初中学科试题库

高中学科试题库