2.
下图是某种遗传病的系谱图(由一对等位基因A、a控制)
(1)该遗传病致病基因是__________(显/隐)性基因,位于_______染色体。
简要说出判断依据:
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__________________________________________________________________________________________。
(2)Ⅲ10基因型是_________________。如果Ⅲ10与Ⅲ7结婚则生出病孩的概率为______________