【简答题】Long ago, in a small village of Wakefield lived two farmers, Harry and Peter. Harry was very hard working while Peter was , Every day Harry got up early and came home late, but Peter walked around for...
【单选题】已知人的红绿色盲属于伴 X 染色体隐性遗传,先天性耳聋是常染色体隐性遗传病( D 对 d 完全显性)。下图中 II-2 为色觉正常的耳聋患者, II-5 为听觉正常的色盲患者。 II-4 (不携带 d 基因)和 II-3 婚后生下一个男孩,这个男孩患耳聋、色盲、既患耳聋又患色盲的概率分别为( )。