余学美 2016-11-30 10:34
<span style="font-size:12px;"> </span> <p style="text-align:justify;vertical-align:baseline;"> <span style="font-family:楷体_GB2312;color:red;font-size:12px;font-weight:bold;">具性别分化</span><span style="font-family:'Times New Roman';color:red;font-size:12px;font-weight:bold;">(</span><span style="font-family:楷体_GB2312;color:red;font-size:12px;font-weight:bold;">雌雄异体</span><span style="font-family:'Times New Roman';color:red;font-size:12px;font-weight:bold;">)</span><span style="font-family:楷体_GB2312;color:red;font-size:12px;font-weight:bold;">的生物才有性染色体</span><span style="font-family:'Times New Roman';color:red;font-size:12px;font-weight:bold;">,</span> </p> <p style="text-align:justify;vertical-align:baseline;"> <span style="font-family:楷体_GB2312;color:black;font-size:12px;font-weight:bold;">如下生物无性染色体：</span><span style="font-family:宋体;color:black;font-size:28pt;"> </span> </p> <p style="text-align:justify;vertical-align:baseline;"> <span style="font-family:'Times New Roman';color:black;font-size:12px;font-weight:bold;">(1)</span><span style="font-family:楷体_GB2312;color:black;font-size:12px;font-weight:bold;">所有无性别之分的生物</span><span style="font-family:'Times New Roman';color:black;font-size:12px;font-weight:bold;">(</span><span style="font-family:楷体_GB2312;color:black;font-size:12px;font-weight:bold;">如酵母菌等</span><span style="font-family:'Times New Roman';color:black;font-size:12px;font-weight:bold;">)</span><span style="font-family:楷体_GB2312;color:black;font-size:12px;font-weight:bold;">均无性染色体。</span><span style="font-family:宋体;color:black;font-size:28pt;"> </span> </p> <p style="text-align:justify;vertical-align:baseline;"> <span style="font-family:'Times New Roman';color:black;font-size:12px;font-weight:bold;">(2)</span><span style="font-family:楷体_GB2312;color:black;font-size:12px;font-weight:bold;">虽有性别之分，但雌雄同株</span><span style="font-family:'Times New Roman';color:black;font-size:12px;font-weight:bold;">(</span><span style="font-family:楷体_GB2312;color:black;font-size:12px;font-weight:bold;">或雌雄同体</span><span style="font-family:'Times New Roman';color:black;font-size:12px;font-weight:bold;">)</span><span style="font-family:楷体_GB2312;color:black;font-size:12px;font-weight:bold;">的生物均无性染色体</span><span style="font-family:'Times New Roman';color:black;font-size:12px;font-weight:bold;">,</span><span style="font-family:楷体_GB2312;color:black;font-size:12px;font-weight:bold;">如玉米、水稻</span><span style="font-family:楷体_GB2312;color:black;font-size:12px;font-weight:bold;">（</span><span style="font-family:'Times New Roman';color:black;font-size:12px;font-weight:bold;">2n=24</span><span style="font-family:楷体_GB2312;color:black;font-size:12px;font-weight:bold;">）</span><span style="font-family:楷体_GB2312;color:black;font-size:12px;font-weight:bold;">等。</span><span style="font-family:宋体;color:black;font-size:28pt;"> </span> </p> <p style="text-align:justify;vertical-align:baseline;"> <span style="font-family:'Times New Roman';color:black;font-size:12px;font-weight:bold;">(3)</span><span style="font-family:楷体_GB2312;color:black;font-size:12px;font-weight:bold;">虽有性别分化且为雌雄异体，但其雌雄性别并非取决于</span><span style="font-family:宋体;color:black;font-size:12px;font-weight:bold;">“</span><span style="font-family:楷体_GB2312;color:black;font-size:12px;font-weight:bold;">染色体类型</span><span style="font-family:宋体;color:black;font-size:12px;font-weight:bold;">”</span><span style="font-family:楷体_GB2312;color:black;font-size:12px;font-weight:bold;">而是取决于其他因素如蜜蜂、蚂蚁、龟等。</span><span style="font-family:宋体;color:black;font-size:28pt;"> </span> </p>