chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell
例句
用作名词(n.)
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。
