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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(2)\"><div class=\"download_card\"><div class=\"card_nr card_nr_lb\"><h4 class=\"card_bt\">突变率的生物学意义及其估算方法</h4><div class=\"download_card_msg\">&ensp;&ensp;&ensp;&ensp; 
&ensp;&ensp;&ensp;&ensp;基因突变率是每个细胞在一个世代的时间内标志基因发生突变的概率，突变率的单位是突变/（世代·细胞）。值得注意的是突变率的概念必须和突变型频度的。下面小编给大家分享突变率的生物学意义及其估算方法，希望能帮助到大家。 突变率的生物学意义及其估算方法文档下载网址链接：</div></div><div class=\"download_card_btn download_card_btn_lb\"><div class=\"content_box_tj\"><span>推荐度：</span><img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\"></div><div class=\"downlod_btn_right demo_tc downlod_btn_right_lb\"><em class=\"downlod_icon\"></em>点击下载文档<span>文档为doc格式</span></div> </div></div></a>';
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