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1·Each of the 46 chromosomes is a member of a homologous pair.

46条染色体的每一条都是一个同源对的成员。

2·This means that homologous chromosomes failed to pair together during meiosis and chromosomes formed fewer crossovers, i. e. sites where they recombine, during the initial stages of meiosis.

这意味着减数分裂中同源染色体不能配对，染色体间形成的交叉也会更少（例如，在减数分裂早期的重组位点）。

3·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。