X染色体在男性上起什么用女为XX男为XY同样男女都有X.
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![X染色体在男性上起什么用女为XX男为XY同样男女都有X.](/uploads/image/z/7095747-3-7.jpg?t=X%E6%9F%93%E8%89%B2%E4%BD%93%E5%9C%A8%E7%94%B7%E6%80%A7%E4%B8%8A%E8%B5%B7%E4%BB%80%E4%B9%88%E7%94%A8%E5%A5%B3%E4%B8%BAXX%E7%94%B7%E4%B8%BAXY%E5%90%8C%E6%A0%B7%E7%94%B7%E5%A5%B3%E9%83%BD%E6%9C%89X.)
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