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【简答题】
有两种罕见的家族遗传病，致病基因分别位染色体和性染色体上。一种先天代谢病称为黑尿病（A，a），病人的尿在空气中一段时间后，就会变黑。另一种因缺少珐琅质而牙齿为棕色（B，b）。图1为一家族遗传图谱。 棕色牙齿是位于（）染色体上的（）性基因决定的。
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