山西省忻州市2018-2019学年八年级下学期期中考试生物试卷
※题型：单选题※知识点：单选题※试题难度：中等<br>香气浓郁的玫瑰花中与有性生殖有关的结构是( )<br>A.萼片 B.花蕊 C.花冠 D.花托<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/ec6cd3f6e2cf46d2abbebfc4d1bcd2b8/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/6689fa16d8f54e409654263bd9f28b49/F4A88BCDF774E7E5D34F5D3D7BEAAD87.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>正常情况下,一个西瓜果实内含有种子的数目取决于( )<br>A.一朵花中有多少雌蕊<br>B.一个胚珠中有多少个卵细胞<br>C.一个雌蕊中有多少个子房<br>D.一个子房中有多少胚珠<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/ce0f59d18ca54b95ae1665e3558720a7/D9A7E0722DAB5479A60928D5B8864BC6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/e70a3f33e974481998bacccdcf6394fe/E7D2DF10A45AC47AC6E468439A1EF7B5.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>用嫁接的方法来繁殖果树和花卉,成活的关键是( )<br>A.接穗要保持湿润<br>B.接穗和砧木的形成层紧密结合在一起<br>C.嫁接的时间要选择好<br>D.接穗和砧木的选择<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2018/4483a52696c142f6b373b0b3ca99df1c/4EF59C4461E28F3B3B09551EB8B9AC3F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2018/b21e8c939ba244c0ad929b3b20fec9e6/910581319D054A90EA0A17AD7A0CB8EC.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>由精子和卵细胞结合形成受精卵,再由受精卵发育形成个体这种生殖方式,其发育的起点是( )<br>A.精子 B.卵细胞 C.受精卵 D.胚胎<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/0499aa0333f4443fae9e8c863e7ccee2/D7C9A679F3C72D4F1064B7D0A0FD4AD8.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/d8d3ff4584764f358a0947389dcc9bd5/DCA0FC5F61ACD9A2E36C5ED0435055C9.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>园林在育苗工作中,可在短时间内大量繁殖幼苗的方法是( )<br>A.组织培养 B.扦插 C.分株 D.嫁接<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/994d2019c99741938576be9e628c65fa/DA50F910BECBBBA4AAB35D7A1AB24524.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/cdfdd35341df4593b441e004453e5e72/62B44DCC53E65A1C52F3C9CA6170B347.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>昆虫的不完全变态发育与完全变态发育少了一个过程是( )<br>A.幼虫 B.卵 C.成虫 D.蛹<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/ca0974af658f42c1a4e25525f044f6a4/D9A7E0722DAB5479A60928D5B8864BC6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/d21928682cd341ac939de9ca442a3d26/D1A96292652E8CC72075532C9F88C316.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>蝗虫是一种常见昆虫,主要以农作物的叶和幼嫩的茎为食,蝗虫的生殖和发育过程要经过( )<br>A.受精卵→若虫→成虫<br>B.受精卵→幼虫→蛹→成虫<br>C.受精卵→蛹→成虫<br>D.跳蝻→成虫<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/10adbbc8102f4401bf24fb55a122765f/DA50F910BECBBBA4AAB35D7A1AB24524.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/3432a5de17794c3082d2dcdd074fab64/275A85879E5371B653520943706EB0ED.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>小蝌蚪在水中游来游去,招人喜爱,但是“小蝌蚪找妈妈”,却找不到。幼体蝌蚪与成体青蛙的显著区别是( )<br>A.蝌蚪陆生、用肺呼吸、无尾、有四肢<br>B.蝌蚪水生、用肺呼吸、有尾、无四肢<br>C.蝌蚪陆生、用肺呼吸、有尾、有四肢<br>D.蝌蚪水生、用鳃呼吸、有尾、无四肢<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/29d5ffad2c4f4c76bbe5257dd23095b5/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/f133b0304d0d42e4af165c3e53679d9d/B2628E26E68B6C571ED6C923C7AEC89F.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列关于两栖动物的生殖和发育说法错误的是( )<br>A.两栖动物的生殖和发育必须在水中<br>B.幼体经过变态发育才能适应陆地生活<br>C.幼体和成体的外部形态和内部结构差别很大<br>D.环境的改变对两栖动物影响不大<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/0b6508d00855443b8f37579dc7b8fbbc/D9A7E0722DAB5479A60928D5B8864BC6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/8d2289d2521a4159af542ace33eccb56/58714FEEED31C8160BEBF1E47D2B52FC.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>“青虫不易捕,黄口无饱期.须臾十来往,犹恐巢中饥.”白居易的这首诗体现了生物繁衍后代的本能.它属于鸟类繁殖行为中的( )<br>A.产卵 B.育雏 C.筑巢 D.求偶<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2013/c179f7dded9a403c876d1499cccba3f1/4EF59C4461E28F3B3B09551EB8B9AC3F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2013/24fd750d1d9a4876954fd7489f11a7a1/F029FBF8E016071836E1D32DC53E2D42.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>拿来几枚鸡蛋,去除蛋壳和卵黄膜我们会发现,有的卵黄上的胚盘色浅而小,有的卵黄上的胚盘色浓略大,这是因为( )<br>A.产蛋母鸡的营养状况不同<br>B.蛋的大小不同<br>C.与将来发育成公鸡或母鸡有关<br>D.是受精卵或未受精卵<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2013/6b6157d0e3a249b4bd1fe9921477b20f/D9A7E0722DAB5479A60928D5B8864BC6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2013/95bad6d54805437ab20bb3ca3eb06f0d/39BD0F6276ED697F054487D23CFD055A.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>下列性状中,属于相对性状的是( )<br>A.狗的黄毛和鹅的白毛 B.狗的黑毛和黄毛<br>C.狗的卷毛和黄毛 D.蛇的爬行和鹅的游泳<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/925e7e4b7b504deebb19976f45753767/4EF59C4461E28F3B3B09551EB8B9AC3F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/336514688b974ba2984df312e7238676/FEEF371965D24A4CF569B74423E173FE.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>一对有耳垂的夫妇,生下一个无耳垂的孩子,则这对夫妇的基因型分别为( )<br>A.Aa和AA B.Aa和aa C.Aa和Aa D.AA和AA<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/f8f8136baf0d4990a9c7a26895ac57bd/D7C9A679F3C72D4F1064B7D0A0FD4AD8.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/3b975513c0514846bef1ec6633041be3/2175CFD853B3154C9D88D13319E366A7.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>胎儿性别决定是( )<br>A.受精卵形成时 B.胎儿生殖器官形成时<br>C.胎儿出生时 D.卵细胞形成时<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/ced726dc5ddf428d8311daeb45ae3399/DA50F910BECBBBA4AAB35D7A1AB24524.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/35f6ff09174c4f4e98fe519a893107d4/6BC288C4E57449A16669D96C086EC912.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>如图表示基因、DNA、染色体三者之间的关系,其中正确的是( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2020/12/8/3BE9D5F7F350C62AADB3AEE9634F9F1C.png"><br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2020/12/8/E1E7A79E86497E99F0F7B3B93AA5BC9C.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2020/12/8/27319B4486B3CAE9C8D714EBF01B5F49.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2020/12/8/24F13A681DF5BC53F1A5875EC03D0CCA.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/a2401edaa9c8497aa3f568eb2de7c3f0/4EF59C4461E28F3B3B09551EB8B9AC3F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/9be35f65297946a790daca21991a54f5/D392C46A471FCBE52DE74DFBCD7A2FB4.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列各组中,染色体数目相同的是( )<br>A.精子和受精卵 B.卵细胞和体细胞<br>C.体细胞和受精卵 D.体细胞和精子<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2013/4c2e500f627b41e2addff58109f74266/D7C9A679F3C72D4F1064B7D0A0FD4AD8.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2013/f6aee5bccbd249fc85a2f690bded1f12/29586641004027BD077F29C8D3AD827F.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>转基因超级鼠的获得证明了( )<br>A.生物的性状是由生殖细胞控制的<br>B.生物的性状是由受精卵控制的<br>C.生物的性状是由染色体控制的<br>D.生物的性状是由基因控制的<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2013/92f719c1a2fd480580462cd7031e517e/D9A7E0722DAB5479A60928D5B8864BC6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2013/9d58342de5f347e4981eb7a45fa90dbb/780F64B8F8E97DB77438D6EFFC2C56FB.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>指纹是辨别人的身份时的一种工具,不同的人指纹不同,原因是( )<br>A.指纹随年龄、性别有差异<br>B.指纹是后天长成的<br>C.指纹是一种性状,是由基因控制的<br>D.与不同的民族和生活条件有关<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/76030fde900b4842a898c66a72379bad/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/b1d9e94485254a98b5bfbb4217da40bc/8905E533CDE7745E75BDED272ED67B52.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>多数高等动物的雌雄比接近1:1的原因是( )<br>A.雌雄个体产生的雌雄生殖细胞数量相等<br>B.雌雄个体都产生数量相等的两种生殖细胞<br>C.雄性个体产生数量相等的两种生殖细胞与雌性个体产生的生殖细胞结合机会相等<br>D.雌性个体产生数量相等的两种生殖细胞与雄性个体产生的生殖细胞结合机会相等<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/5b0d180250c24267a26865e85bc5f626/D7C9A679F3C72D4F1064B7D0A0FD4AD8.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/189b2b99614345f0a2035544742e8108/CF9C260EA57D9CF5B4AA26D8AB0DD0C0.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>黑尿症由隐性基因控制,两个都带有黑尿症基因的正常男女结婚,预测他们的孩子患黑尿症的机率是( )<br>A.75% B.50% C.25% D.12.5%<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/40f78ec2293b4dd78dca6307ab481c21/D7C9A679F3C72D4F1064B7D0A0FD4AD8.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/0b398b436c3c4982910de021a1155c14/9BB7D147BD4DDC77D458EA209BE90905.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>羊的毛色白色对黑色为显性,两只杂合白羊为亲本,接连生下了3只小羊是白羊,若他们再生第4只小羊,其毛色( )<br>A.一定是白色的 B.是白色的可能性大<br>C.一定是黑色的 D.是黑色的可能性大<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/a57ce369a8f249c3a0c194854fb15757/4EF59C4461E28F3B3B09551EB8B9AC3F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/9be5ea40ba174e7eb1a9f31a0299adbc/0F63830C5CB67A346C45F5E92EEA9414.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>纯种甜玉米和纯种非甜玉米间行种植,收获时发现甜玉米果穗上有非甜玉米籽粒,而非甜玉米果穗上却无甜玉米籽粒.原因是( )<br>A.甜是显性状 B.甜是非显性状<br>C.显性的相对性 D.环境引起的变异<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/597f66069d26408ba94a72ca7cde2051/4EF59C4461E28F3B3B09551EB8B9AC3F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/08ee6420a3c142ebaef8a36c83874a8b/E30EA4C7F265A80D9FA9EB7EF97F12B7.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>下列叙述中,不属于生物进化总体趋势的是( )<br>A.由水生到陆生 B.由体型小到体型大<br>C.由低等到高等 D.由简单到复杂<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/2749651714564a1190cb7b0693da91be/4EF59C4461E28F3B3B09551EB8B9AC3F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/31cb78d2eb5f4569af4e84521f4ae862/9B4D72D22B6B4A0351174639B840AD39.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>植物的生殖方式有和.<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/f30ca10e90a041a5a8eb2c60144b63b8/D01B32C2C611DC964B0E17DF62746D7C.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/cad2fcba2c6b4bc19493390d2f120c35/65ACFA7F4BF14895BBAD73A64501AFD2.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>同家蚕一样,蜜蜂、、蝇等昆虫的发育也要经过、、、成虫四个时期,这样的发育过程称为完全变态。蝗虫的发育过程要经过卵、、成虫三个时期,像这样的发育过程,称为。不完全变态的昆虫还有。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/f3e4d9da971644288c90f3a4364fe250/58CDDA58C7C3D08B776420F337C6F26F.png"><br>解析<br>略<br>※题型：填空题※知识点：填空题※试题难度：中等<br>两栖动物生殖发育特点:生殖和幼体的发育必须在中进行,幼体要经过变态发育才能上生活.<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/15f0e32febdd452a8f798359f4545986/41FC879750442BF9A13B96A1F4A0ACA5.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/36741f47463e48cf81b91e789da1e459/24D1983BAF63FF89CC021E4EF06531B0.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>在生物细胞(生殖细胞除外)中,染色体是存在的.人的体细胞中染色体为对.<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/1d14c4bf4ad349e09a3aa06362eaa8a0/BF8A67A18BB65F5FC408ED59E18E2ACB.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/a41348d69d514ce3bbe02f7515494b48/238DFD4A6F6BFDFF860A7982E98B9704.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>达尔文认为:自然界中的生物,在生存斗争中,通过激烈的竞争,生存,被淘汰的过程,称为.<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/89794c3b718f4487970d9f94f6bc8be1/685285438D48BAC3490166EF804CFF3D.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/d2f1e35ba611484ea0e6d4adb4c31f9a/F8D3AAAB3A2778836EA19FD34B787456.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>在研究生物进化过程中,是最直接、最重要的证据.<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/f463323c32be435bacf9d0dcaaf3ae60/21977D981FE4DC86744CD81A59C02F49.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/ec4de0da2f9b455fa46106cb648588e0/ACBE526A93FF14BC9E560CAA6FB084C2.png"><br><br>※题型：判断题※知识点：判断题※试题难度：中等<br>自然界中,遗传是普遍存在的,变异偶尔才出现.<br>( <br>)<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/61ac9d29f1a1406da71d0ef7091d685c/B4F624DAE646E750151FFAD3FF71C09F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/d4feeeff130b4c5993b946d024eff7bf/E1124652B88BABF57D2FD07B1EDE0E3A.png"><br><br>※题型：判断题※知识点：判断题※试题难度：中等<br>表现出来性状相同的个体,基因一定相同。( )<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/1a1883c810564d6e8b6f40e5611b5f15/B4F624DAE646E750151FFAD3FF71C09F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/6f2c3feaab7546e29bfa5bc05202d67e/EBA15989595B97034EA6593906948AB5.png"><br><br>※题型：判断题※知识点：判断题※试题难度：中等<br>父母都是双眼皮,生下的子女也一定都是双眼皮。( )<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/298bf9189b5141cb8ea6e1656e265fe0/B4F624DAE646E750151FFAD3FF71C09F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/8b097d1946b84f3bacb2ef95896204ed/CDD40625CF63617691C67152E168CC8A.png"><br><br>※题型：判断题※知识点：判断题※试题难度：中等<br>生物所有的性状都可以遗传,还与环境有关系。( )<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/40041400876b474382711ff3ba14feee/B4F624DAE646E750151FFAD3FF71C09F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/fe3ead071843458fb40edf07ace8373b/CEFB8830848F2DF23A02594C86DB8B96.png"><br><br>※题型：判断题※知识点：判断题※试题难度：中等<br>所有鸟的繁殖都有求偶、交配、筑巢、产卵、孵卵、育雏的行为.( )<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/f4077ee28ff04cb8a8e2dcc2bcb1590c/B4F624DAE646E750151FFAD3FF71C09F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/6d028fce30354d9ab47e4d3c50e8ee73/36EF230FFC9EEB73EE8EAB2EC6573F0A.png"><br><br>※题型：判断题※知识点：判断题※试题难度：中等<br>克隆羊多利是通过无性生殖的方式来的。( )<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/924692b9150f47c6bae98fab6a84afdb/4BEBB1570D38D48581548ADA86554D97.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/9cfefcfcdc104c27b9f16e1c5899b680/7962DA912FD71BE2D779A9EF1F2D6A2A.png"><br><br>※题型：判断题※知识点：判断题※试题难度：中等<br>近亲结婚的后代必然会患遗传病.( )<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/4446b1a076544b6a83584bdf585cb028/B4F624DAE646E750151FFAD3FF71C09F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/306d124def4f4c8da6661412bc7f7ae8/826F8A1E39750EF7D3D75CF54556D1F5.png"><br><br>※题型：判断题※知识点：判断题※试题难度：中等<br>蝗虫的若虫能跳跃,又称为跳蝻。( )<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/e7ba545fae7d4703a9a50cf21439be4e/4BEBB1570D38D48581548ADA86554D97.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/d4fbd33df3e648d98873b6653e173364/7E0B8B48DDA8930A0541DAD9655C1693.png"><br><br>※题型：判断题※知识点：判断题※试题难度：中等<br>今天这样丰富多彩的生物都是由最原始的生命进化而来的。( )<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/781c35d3b06b4d04b3be24c64f178da2/4BEBB1570D38D48581548ADA86554D97.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/b1faad5cc8384793b5dc65ec49b2588b/9FBB1BD1EBE50C32E33A12DFDA181935.png"><br><br>※题型：判断题※知识点：判断题※试题难度：中等<br>性染色体上只有决定性别的基因。( )<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/d1897444713142e1a15f3211cbb1722f/B4F624DAE646E750151FFAD3FF71C09F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/2bbb7521fcbf4868950fbd2922d4e828/DA05942742B5662CC6BAE17FEF8ACB6F.png"><br><br>※题型：读图填空题※知识点：读图填空题※试题难度：中等<br>如图是鸡卵的结构模式图,请据图回答下列问题:<img 1.注明图中结构的名称:①,②,③,④。<br>2.在鸡卵中起保护作用的是。<br>3.为胚胎发育提供营养的是。<br>4.细胞核位于。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/e293331ed50f4fce84122162ce26694e/B2494F62163E36B295594262514BAA6F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/e50c794ccc8646c3b678ca689fd3649b/A2358B71693758C2D6A5F08B09121BB7.png"><br><br>※题型：读图填空题※知识点：读图填空题※试题难度：中等<br>观察如图羊的毛色遗传图解,据图回答下列问题:<img 1.羊毛色中的白毛和黑毛在生物学上称为,羊毛色中的显性性状是,隐性性状是。<br>2.若显性基因用A表示,隐性基因用a表示,则亲代白毛羊基因组成是,黑毛羊基因组成是。<br>3.子一代全是白毛羊,其隐性基因控制的性状还能遗传吗? (能、不能);子一代的基因组成是。<br>4.子二代出现了白毛羊和黑毛羊,从理论上分析应该是羊的数量多,它的基因组成是;若让子二代的白毛羊相互交配,得到的子三代毛色是。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/6159892bfcdd4ad8b6c606751c4b54f4/B610C35708133AC979AA94CCFB25C3DB.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/5d4b2a4f528d44578b5c8e226d726c57/830DF24A582E3051267B0B82F289E092.png"><br><br>
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