河南省信阳市2018_2019学年高二生物上学期期末考试试题(扫描版).doc

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1、12345678920182019 学年上期期末考试高中二年级 生物 参考答案一、选择题(每题 2 分,共 50 分)题 号 1 2 3 4 5 6 7 8 9 10答 案 B B C D C D C D D C题 号 11 12 13 14 15 16 17 18 19 20答 案 D B D D C C A B C B题 号 21 22 23 24 25答 案 B D D C D二、非选择题(除注明外,每空均为 1 分,共 50 分)26 (12 分)(1)2 次级卵母细胞和(第一)极体(2 分)(2) (3)DNA 分子的复制 着丝点的分裂 BC(4)DNA 复制时产生差错或四分体时期发

2、生过交叉互换(2 分)(5)染色体复制一次,细胞分裂两次,子细胞染色体数目减半(2 分)27 (12 分)(1)晚熟 基因的自由组合(2)2(2 分)(3)AaBb 11 31(4)8 4/5 1/4(5)31(2 分)28(13 分)(1)X 的非同源区段 Y 的非同源区段(2) 单基因 调查群体足够大,并且随机取样(2 分)常染色体隐性遗传病(2 分) 1/3 显性 -1 和-2 都是患者,但-1 正常(2 分)10/19(2 分)29 (13 分)(1)解旋酶 DNA 聚合酶 1/2 (2)有遗传效应的 DNA 片段 不是 (4 种游离的)核糖核苷酸 (3) 翻译 右 3 大于(4)复制和表达遗传信息(2 分)10

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