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.
而对于多倍体生物，如体细胞中每条染色体具有三个或三个以上的拷贝，二体或双体就是一种非整倍体状况。
For organisms that normally have three or more copies of each chromosome (those that are triploid or above), disomy is an aneuploid chromosome complement.
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