甘肃省天水市武山县三校2020-2021学年高二上学期期中联考生物试卷
※题型：单选题※知识点：单选题※试题难度：中等<br>下列杂交组合属于测交的是( ) A.FfGg<img src="https://picture2.zhihuicn.com/testImage/1/2020/12/17/7537A84B42B88494ADC2932CCC78372D.png"><br>Ffgg<br>B.FfGg<img src="https://picture2.zhihuicn.com/testImage/1/2020/12/17/7537A84B42B88494ADC2932CCC78372D.png"><br>FfGg<br>C.ffgg<img src="https://picture2.zhihuicn.com/testImage/1/2020/12/17/7537A84B42B88494ADC2932CCC78372D.png"><br>ffgg<br>D.FfGg<img src="https://picture2.zhihuicn.com/testImage/1/2020/12/17/7537A84B42B88494ADC2932CCC78372D.png"><br>ffgg<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2020/5497175c8eaf457c8a8b1d0b3c4e92ad/2BB966A0E0D0EF1A330D14E3ADEDA5C5.png"><br>解析<br>略<br>※题型：单选题※知识点：单选题※试题难度：较易<br>下列属于等位基因的是( )<br>A.A与b B.Y与y C.E与E D.f与f<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2015/ce4d02c0dc3f4b5bae3993d4f9b6ecb6/CB10E80A5A739A58F1312BA12F379467.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/1/9/2015/e379e879f38d439081aa089912c6dba2/BC1410D7FAF1761CEF0C0BBBCB88C25C.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>在色盲男孩的父母,祖父母,外祖父母中,除了祖父是色盲外,其他人色觉均正常。这个男孩的色盲基因来自( )<br>A.祖父 B.祖母 C.外祖父 D.外祖母<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2019/fd074ce4369843e2812f9888f5065e2b/2BB966A0E0D0EF1A330D14E3ADEDA5C5.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/1/9/2019/c379a9530ee0492e800d5a67cd15dadf/33AC03121167CC56D8D164F8EE6A0270.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>“DNA是主要的遗传物质”是指( )<br>A.遗传物质的主要载体是染色体<br>B.多数生物的遗传物质是DNA<br>C.细胞里的DNA大部分在染色体上<br>D.染色体在遗传中起主要作用<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2018/ff45c974be7143a7bac874e75e9be02d/CB10E80A5A739A58F1312BA12F379467.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/1/9/2018/885d893a84754ca9bb0f95fe257c9c69/6638056FD4FCE42FDAD3E282C83DDD73.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>若DNA分子中一条链的碱基A:C:T:G=1:2:3:4,则另一条链上A:C:T:G的值为( )<br>A.1:2:3:4 B.3:4:1:2 C.4:3:2:1 D.1:3:2:4<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2020/3e735bd87a1c48eea7f3cd098a11daa4/CB10E80A5A739A58F1312BA12F379467.png"><br>解析<br>略<br>※题型：单选题※知识点：单选题※试题难度：较易<br>一个转运RNA的一端三个碱基是CGA,此转运RNA转运的氨基酸是( )<br>A.精氨酸(密码子CGA) B.丙氨酸(密码子GCU)<br>C.酪氨酸(密码子UAU) D.谷氨酸(密码子GAG)<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2019/274424e94ec84b999cec953adfc9f07c/CB10E80A5A739A58F1312BA12F379467.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/1/9/2019/ed95d6c6122440f9b9403d6b228758fb/4DC6DEA6A42D94523AD66908E8A206E7.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>性染色体存在于( )<br>A.卵细胞 B.精子<br>C.体细胞 D.以上三种细胞<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2020/77c82e19262346aa8bc4a96de52359bd/2BB966A0E0D0EF1A330D14E3ADEDA5C5.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/1/9/2020/e3bc93a4cfd444c79f3cbc5bfcf9e9eb/850D39B7228B96977EF54287BED9B8C0.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>组成人体蛋白质的20种氨基酸对应的密密码子共有( )<br><tbody><br></tbody><br>A.4 B.20 C.61 D.64<br>答案<br><img src="https://picture2.zhihuicn.com/answer/1/9/2015/56a681d664614cfe9240a0c6037b6bb7/F3FFF02E67737AECAA5F9376DCA7D618.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/1/9/2015/cd3061fd6e4e4a50b966792293ff72fd/4FC19839A847A146D50BB076E7EA154A.png"><br><br>
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