1.非选择题- (共2题)

(1)该生物体细胞中含有的染色体数目为 。用光学显微镜观察图c细胞中的染色体,需先用________进行染色。图中细胞在显微镜下可观察到同源染色体的是________(填字母序号)。(2)图中细胞c处于__________(时期),细胞h的名称是__________;正常情况下会发生等位基因分离的细胞是__________(填字母序号)。
(3)细胞d到细胞f的过程被称为________,细胞e和细胞f在形态结构和生理功能上不同的根本原因是两种细胞内________(物质)不相同。
番茄是二倍体植物(染色体2N=24)。有一种三体,其6号染色体的同源染色体有三条(比正常的番茄多了一条6号染色体)。三体在减数分裂联会时,形成一个二价体和一个单价体;3条同源染色体中的任意2条随意配对联会,另1条同源染色体不能配对,减数第一次分裂的后期,组成二价体的同源染色体正常分离,组成单价体的1条染色体随机地移向细胞的任何一极,而其他如5号染色体正常配对、分离(如图所示)。

(1)在方框中绘出三体番茄减数第一次分裂后期图解。(只要画出5、6号染色体就可以,并用“5、6号”字样标明相应的染色体)

(2)设三体番茄的基因型为AABBb,则花粉的基因型及其比例是________________。则根尖分生区连续分裂两次所得到的子细胞的基因型为________。
(3)从变异的角度分析,三体形成的原因是_____________________________________。
(4)以马铃薯叶型(dd)的二倍体番茄为父本,以正常叶型(DDD)的三体番茄为母本(纯合体)进行杂交。试回答下列问题:
①假设D(或d)基因不在第6号染色体上,使F1的三体植株正常叶型与二倍体马铃薯叶型杂交,杂交子代叶型的表现型及比例为________。
②假设D(或d)基因在第6号染色体上,使F1的三体植株正常叶型与二倍体马铃薯叶型杂交,杂交子代叶型的表现型及比例为________。
2.单选题- (共9题)

A. 图1中的B组细胞位于图3中的甲~乙段,细胞中发生的主要变化是DNA的复制和有关蛋白质的合成
B. 图l中C组的细胞不都位于图3的乙~丙段
C. 图2中F组细胞变成E组细胞的过程发生在图3的丙~丁段
D. 图2中,D组细胞表示精细胞,E组细胞可以表示精原细胞,也可以表示次级精母细胞

A.③ | B.①③ | C.②④ | D.①③④ |
A.由毛长短这对相对性状上的性别差异可知这对等位基因位于性染色体上 |
B.一对长毛兔交配,子代可能出现短毛兔,且该短毛兔一定为雌兔 |
C.一对短毛兔杂交出现了长毛兔,则这一对兔的后代中长毛兔约占1/2 |
D.安哥拉兔的毛长短这对相对性状的遗传不遵循基因分离定律 |
A.4 | B.8 | C.10 | D.12 |
A.甲、乙两个小桶分别代表雌、雄生殖器官 |
B.甲、乙两个小桶内的小球分别代表雌雄配子 |
C.甲、乙两个小桶中小球的数量一定要相等 |
D.每次抓取的小球都要放回原桶中再进行下一次抓取 |
A.自交结果中黄色非甜与红色甜比例9:1 |
B.自交结果中黄色与红色比例3:1,非甜与甜比例3:1 |
C.自交结果中与亲本表现型相同的所占子代的比例为5/8 |
D.测交结果中红色非甜所占子代的比例为1/4 |
A.aabb×Ab B.AaBb×ab C .Aabb × aB D.AaBb×Ab
3.选择题- (共5题)
【1】Fires can burn down trees. They can hurt people. They are very dangerous. We must be careful with fires. What must we do when there is a fire? We must go outside quickly and never take the lift. We must call 119. We have a fire drill at school every year.
【2】A fire drill is not a real (真实的)fire. It helps us prepare (准备) for a real fire. First, the fire alarm sounds. Next we all line up in the classroom. Then we leave the classroom quickly. We mustn't run. We must leave all our things in the classroom.
【3】Then we walk down the stairs and go outside. We line up in the playground. Our teacher checks on us. We wait for the firemen to come.
【1】Fires can burn down trees. They can hurt people. They are very dangerous. We must be careful with fires. What must we do when there is a fire? We must go outside quickly and never take the lift. We must call 119. We have a fire drill at school every year.
【2】A fire drill is not a real (真实的)fire. It helps us prepare (准备) for a real fire. First, the fire alarm sounds. Next we all line up in the classroom. Then we leave the classroom quickly. We mustn't run. We must leave all our things in the classroom.
【3】Then we walk down the stairs and go outside. We line up in the playground. Our teacher checks on us. We wait for the firemen to come.
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【1】题量占比
非选择题:(2道)
单选题:(9道)
选择题:(5道)
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【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:10
5星难题:0
6星难题:0
7星难题:0
8星难题:1
9星难题:0