我碰到这么一个题 :就红绿色盲和白化病而言.母亲基因型是XBXbAa 父亲是XbYAa 然后问生一个两病都患的男孩的概率是多少.答案是1/8 但我怎么觉得是1/16?为什么不用乘1/2
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![我碰到这么一个题 :就红绿色盲和白化病而言.母亲基因型是XBXbAa 父亲是XbYAa 然后问生一个两病都患的男孩的概率是多少.答案是1/8 但我怎么觉得是1/16?为什么不用乘1/2](/uploads/image/z/5420756-20-6.jpg?t=%E6%88%91%E7%A2%B0%E5%88%B0%E8%BF%99%E4%B9%88%E4%B8%80%E4%B8%AA%E9%A2%98+%EF%BC%9A%E5%B0%B1%E7%BA%A2%E7%BB%BF%E8%89%B2%E7%9B%B2%E5%92%8C%E7%99%BD%E5%8C%96%E7%97%85%E8%80%8C%E8%A8%80.%E6%AF%8D%E4%BA%B2%E5%9F%BA%E5%9B%A0%E5%9E%8B%E6%98%AFXBXbAa+%E7%88%B6%E4%BA%B2%E6%98%AFXbYAa+%E7%84%B6%E5%90%8E%E9%97%AE%E7%94%9F%E4%B8%80%E4%B8%AA%E4%B8%A4%E7%97%85%E9%83%BD%E6%82%A3%E7%9A%84%E7%94%B7%E5%AD%A9%E7%9A%84%E6%A6%82%E7%8E%87%E6%98%AF%E5%A4%9A%E5%B0%91.%E7%AD%94%E6%A1%88%E6%98%AF1%2F8+%E4%BD%86%E6%88%91%E6%80%8E%E4%B9%88%E8%A7%89%E5%BE%97%E6%98%AF1%2F16%3F%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E7%94%A8%E4%B9%981%2F2)
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