13.一个男孩,略有智力落后,核型分析发现他的染色体总数46,包括一条环形第一号染色体,如何正确书写他的核型符号?A.46,XY,+r(1)B.46,XY,+(r1)C.46,XY,+r(1-)D.46,XY,r(1-)E.46,XY,r(1)14.一个15/21易位型Down综合
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![13.一个男孩,略有智力落后,核型分析发现他的染色体总数46,包括一条环形第一号染色体,如何正确书写他的核型符号?A.46,XY,+r(1)B.46,XY,+(r1)C.46,XY,+r(1-)D.46,XY,r(1-)E.46,XY,r(1)14.一个15/21易位型Down综合](/uploads/image/z/15103153-1-3.jpg?t=13.%E4%B8%80%E4%B8%AA%E7%94%B7%E5%AD%A9%2C%E7%95%A5%E6%9C%89%E6%99%BA%E5%8A%9B%E8%90%BD%E5%90%8E%2C%E6%A0%B8%E5%9E%8B%E5%88%86%E6%9E%90%E5%8F%91%E7%8E%B0%E4%BB%96%E7%9A%84%E6%9F%93%E8%89%B2%E4%BD%93%E6%80%BB%E6%95%B046%2C%E5%8C%85%E6%8B%AC%E4%B8%80%E6%9D%A1%E7%8E%AF%E5%BD%A2%E7%AC%AC%E4%B8%80%E5%8F%B7%E6%9F%93%E8%89%B2%E4%BD%93%2C%E5%A6%82%E4%BD%95%E6%AD%A3%E7%A1%AE%E4%B9%A6%E5%86%99%E4%BB%96%E7%9A%84%E6%A0%B8%E5%9E%8B%E7%AC%A6%E5%8F%B7%3FA.46%2CXY%2C%2Br%281%29B.46%2CXY%2C%2B%28r1%29C.46%2CXY%2C%2Br%281-%29D.46%2CXY%2Cr%281-%29E.46%2CXY%2Cr%281%2914.%E4%B8%80%E4%B8%AA15%2F21%E6%98%93%E4%BD%8D%E5%9E%8BDown%E7%BB%BC%E5%90%88)
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