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    【题目】色盲是伴X染色体隐形遗传病，一对正常的夫妇生出一个色盲的孩子，请回答下列问题：

    （1）这对夫妇生出色盲患者的概率是_________ ；

    （2）生出的男孩中，患色盲病的占 _____________ ；

    （3）正常的男孩的基因型是____________ 。

    （4）母亲的基因型是 。

    【答案】

    （1）1/4,

    （2）1/2

    （3）XBY

    （4）XBXb

    【解析】

    一对正常的夫妇生出一个色盲的孩子，所以这对夫妇的基因型为XBY和XBXb。后代的基因型为XBXB、XBXb、XBY、XbY（1）这对夫妇生出色盲患者XbY的概率是1/4。（2）生出的男孩XBY、XbY中，患色盲病XbY的占1/2。（3）正常的男孩的基因型是XBY。（4）母亲的基因型是XBXb。

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