除了正常染色体对以外，还存在有第二种同源染色体的非整倍体状态，被称为三体性。
An aneuploid state in which a third homologous chromosome is present in addition to the normal autosomal pair is called trisomy.
除了正常染色体对以外，还存在有第二种同源染色体的非整倍体状态，被称为三体性。
An aneuploid state in which a third homologous chromosome is present in addition to the normal autosomal pair is called trisomy.
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