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

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• 1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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• 2一个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

  A.44%

  B.24%

  C.14%

  D.28%

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• 3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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• 4如果用³²P、³⁵S、¹⁵N标记噬菌体后，让其侵染细菌，在产生的子代噬菌体组成结构中，能够找到的放射性元素为

  A.可在外壳中找到³⁵S、¹⁵N

  B.可在DNA中找到³²P、¹⁵N

  C.可在外壳中找到³²P、¹⁵N

  D.可在DNA中找到³²P、³⁵S、¹⁵N

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• 5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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• 6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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• 7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; BORDER-COLLAPSE: collapse; MARGIN-LEFT: 73.55pt; 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; 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: medium none; PADDING-BOTTOM: 0cm; 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: medium none; PADDING-BOTTOM: 0cm; 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: medium none; PADDING-BOTTOM: 0cm; 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: medium none; 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mso-border-top-alt: solid windowtext .5pt" width="63">1</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: medium none; 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: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: medium none; 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: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; 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BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 11.75pt; BORDER-TOP: medium none; 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: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 11.75pt; BORDER-TOP: medium none; 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: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 11.75pt; BORDER-TOP: medium none; 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; PADDING-LEFT: 5.4pt; WIDTH: 47.8pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: medium none; 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: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 47.6pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: medium none; 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: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: medium none; 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: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: medium none; 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: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 47.65pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: medium none; 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; PADDING-LEFT: 5.4pt; WIDTH: 47.8pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: medium none; 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: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 47.6pt; PADDING-RIGHT: 5.4pt; HEIGHT: 12.35pt; BORDER-TOP: medium none; 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: medium none; PADDING-BOTTOM: 0cm; 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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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• 8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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• 9用³²P标记的噬菌体侵染大肠杆菌，经培养、搅拌、离心后，检测到上清液的放射性低，沉淀物的放射性高。上清液带有放射性的原因可能是

  A.培养时间过长

  B.培养时间过短

  C.搅拌不充分

  D.离心时转速过高

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• 10下列对mRNA的描述，正确的是

  A.mRNA可作为合成蛋白质的直接模板

  B.mRNA上的每三个相邻的碱基决定一个氨基酸

  C.mRNA上有四种脱氧核苷酸、64种密码子、代表20种氨基酸

  D.mRNA只有与核糖体结合后才能发挥作用

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