2020-2021学年生物人教版八年级下册随堂检测（8）人的性别遗传
※题型：单选题※知识点：单选题※试题难度：中等<br>如图所示为雌果蝇体细胞中的染色体,其卵细胞染色体的组成是( )<img src="https://picture2.zhihuicn.com/testImage/2/2019/6/29/9846D585EE57BA03A2D90FFC49FF9FAF.png"><br>A.a、b、X B.a、b、c、X<br>C.a、b、c D.a、a、b、b、c、c、X、X<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/b53d6fb0c7e847de987d17e7f383cfcf/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/5ad9b29407004172b545a7d7fb48e97b/D390A54C1DD58B0684CF134DAA338BC8.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>生男生女到底是怎么回事?生男生女的机会是否均等?小君经过探究后绘制的生男生女图解如下。请据图回答问题:<img src="https://picture2.zhihuicn.com/testImage/2/2019/4/29/322E24460AD86A95202B454FC31BE950.png"><br>(1)<br>图中括号内<br>XX<br>、X<br>Y<br>表示性染色体。<br>(2)<br>有人认为生男还是生女的责任全在女性,这种想法对吗?<br>(3)<br>由图解分析可知,从<br>理论上讲生男生<br>女的机会是<br>(填“均等”或“不均等”)的。<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/7bbd49e360dc47aca684c7d01c3a276e/0426200910E3A1EF59F94D68BE1F06E9.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/9fb2e8573d6547ae8ff09aa18a47d595/1CC453E5FC176611A366BC9BFB26E1F4.png"><br><br>
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