调查是生物学研究的方法之一，下列调查方法的应用正确的是（ ）。
正确答案及解析
正确答案
解析
样方调查种群密度必须随机取样，而不能在水草丰富的浅水区确定样方，故A错误；由于动物的生活范围大，所以调查动物的活动范围和迁徙路线一般用标志重捕法，故B正确；酵母菌用液体培养基来培养，培养液中的酵母菌种群的增长情况与培养液中的成分、空间、pH、温度等因素有关，所以要定期从酵母菌培养液中取样计数，调查其种群增长，故C正确；单基因遗传病的发病率相对较低，因此调查某单基因遗传病的发病率，需要在较大的样本人群中进行，故D正确。
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