一个DNA分子的一条链上，腺嘌呤比鸟嘌呤多40%，两者之和占DNA分子碱基总数的24%，则该DNA分子的另一条链上，胸腺嘧啶占该链碱基数目的    （    ）

试卷相关题目

• 1以下细胞中既有同源染色体，又含染色单体的是          （    ）①有丝分裂中期细胞                ②有丝分裂后期细胞③减数第一次分裂中期细胞            ④减数第二次分裂中期细胞⑤减数第一次分裂后期细胞          ⑥减数第二次分裂后期细胞

  A.①③⑤

  B.②④⑥

  C.①②③

  D.④⑤⑥

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• 2下列有关遗传变异的四种说法，不正确的是         （    ）

  A.中心法则体现了遗传信息传递的一般规律

  B.马和驴杂交生出的骡子是二倍体

  C.高茎豌豆（Dd）产生的雌、雄配子的比例为1∶1

  D.基因突变不一定引起生物的性状发生改变

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• 3在人体体细胞增殖的一个细胞周期中，在纺锤体形成时，一个细胞中的染色体数为N，DNA含量为m；则当该细胞中染色单体消失时，细胞中的染色体数和DNA含量分别是（    ）

  A.2N和m

  B.N／2，和m／2

  C.2N和m／2

  D.N和m

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• 4减数分裂过程中不会出现的变化是            （    ）

  A.遗传物质复制一次，细胞分裂两次

  B.随着着丝点的分裂DNA分子数加倍

  C.同源染色体交叉互换

  D.同源染色体的联会现象

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• 5科学的研究方法是取得成功的关键。下列关于人类探索遗传奥秘历程中的科学实验方法及技术的叙述，不正确的是             （    ）

  A.孟德尔在研究豌豆杂交实验时，运用了假说—演绎法

  B.萨顿根据基因和染色体的行为存在平行关系，类比推理出基因位于染色体上

  C.沃森和克里克研究DNA分子结构时，运用了建构物理模型的方法

  D.格里菲思利用肺炎（双）球菌研究遗传物质时，运用了放射性同位素标记法

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• 6同位素标记法用于追踪物质的运行和变化规律。下面实例研究方法与结果相符的是（    ）

  A.用¹⁴C标记的噬菌体侵染细菌，证明了DNA是遗传物质

  B.用¹⁵N标记的核苷酸弄清了分裂期染色体形态和数目的变化规律

  C.用³²P标记的噬菌体侵染细菌，经过保温、搅拌、离心，可检测到沉淀物中放射性很低

  D.用³H标记亮氨酸，发现分泌蛋白在细胞内合成与分泌的顺序是核糖体、内质网、高尔基体、细胞膜

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• 7从某动物产生的精子中提取出四个，经测定基因型分别为AB、Ab、aB、ab，若不考虑交叉互换与基因突变，下列说法不正确的是        （    ）

  A.这四个精子至少来自两个精原细胞

  B.这四个精子可能来自同一个精原细胞

  C.AB、ab不可能来自同一个次级精母细胞

  D.AB、Ab不可能来自同一个初级精母细胞

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• 8下列有关细胞分裂的叙述正确的是             （    ）

  A.植物细胞有丝分裂过程中，细胞内所有的DNA经复制后平均分配到子细胞中

  B.精子形成过程中，若某一对同源染色体未分开，则形成的精子有一半不正常

  C.观察动物精巢切片时，可能会同时观察到有丝分裂和减数分裂不同时期的细胞

  D.有丝分裂和减数分裂完成后的细胞都会立即进入下一个细胞周期

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• 9下表是分析豌豆的两对基因遗传情况所得到的F2基因型结果（非等位基因位于非同源染色体上），表中列出部分基因型，有的以数字表示。下列叙述正确的是    （    ）<table style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; MARGIN: auto auto auto 73.55pt; BORDER-COLLAPSE: collapse; BORDER-TOP: medium none; BORDER-RIGHT: medium none; mso-border-alt: solid windowtext .5pt; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt; mso-border-insideh: .5pt solid windowtext; mso-border-insidev: .5pt solid windowtext" border="1" cellspacing="0" cellpadding="0" _dj="MsoNormalTable"><tbody><tr style="HEIGHT: 11.75pt; mso-yfti-irow: 0; mso-yfti-firstrow: yes"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.8pt; PADDING-RIGHT: 5.4pt; HEIGHT: 11.75pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt" width="64">配子</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.6pt; PADDING-RIGHT: 5.4pt; HEIGHT: 11.75pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width="63">YR</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 11.75pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width="64">Yr</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 11.75pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width="64">yR</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 11.75pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width="64">yr</td></tr><tr style="HEIGHT: 12.35pt; mso-yfti-irow: 1"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.8pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="64">YR</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.6pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="63">1</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="64">2</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="64"> </td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="64">YyRr</td></tr><tr style="HEIGHT: 11.75pt; mso-yfti-irow: 2"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.8pt; PADDING-RIGHT: 5.4pt; HEIGHT: 11.75pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="64">Yr</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.6pt; PADDING-RIGHT: 5.4pt; HEIGHT: 11.75pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="63"> </td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 11.75pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="64"> </td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 11.75pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="64">3</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 11.75pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="64"> </td></tr><tr style="HEIGHT: 12.35pt; mso-yfti-irow: 3"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.8pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="64">yR</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.6pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="63"> </td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="64"> </td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="64"> </td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width="64">4</td></tr><tr style="HEIGHT: 12.35pt; mso-yfti-irow: 4; mso-yfti-lastrow: yes"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.8pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="64">yr</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.6pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="63"> </td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="64"> </td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="64"> </td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" valign="top" width="64">yyrr</td></tr></tbody></table>

  A.表中Y、y、R、r基因不一定都在细胞核中

  B.1、2、3、4代表的基因型在F2中出现的概率大小为3＞2 = 4＞1

  C.F2中出现表现型不同于亲本的重组类型的比例是6/16或10/16

  D.表中表示F1雌雄配子的随机结合

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• 10通过测交可以推测被测个体            （    ）

  A.是否是纯合体

  B.产生配子的比例

  C.基因型

  D.产生配子的数量

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